A radioactive element has a half-life of 2,000 years. If a sample of this element begins with a mass of 100 grams, how long would you have to wait for the mass to decrease to 25 grams?

Answers

Answer 1

Therefore, a half-life of 2000 years saying that 100 grams will decompose to 50 grams in 2000 years. That 50 g will decompose to the requested 25 grams in another 2000 years. 2,000 + 2,000 = 4,000 years are required.

Describe element.

Elements are substances that cannot further breakdown as a result of any chemical reaction. There are a certain number of protons in each element's atom.

Which elements are important?

Since they make the organic compounds that are present in all living things, chemical elements are crucial to living things. Carbon is the primary element in all organic compounds, including lipids, nucleic acids, proteins, and carbohydrates.

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Related Questions

HELP LIMITED TIME ASAP!!!!!!!!!!!!!!
Which greenhouse gas do humans release into the atmosphere the
most?

Select one:
1, Nitrogen

2, Water Vapor

3, Oxygen

4, Carbon Dioxide

Answers

Answer: Carbon dioxide

Explanation:Because,Carbon dioxide from the burning of fossil fuels is the largest single source of greenhouse gas emissions from human activities.

alcoholic sugar oxygen CO2 ATP aerobic


The yeast were performing _____________ fermentation by converting the __________
into _______. This process produces _______, which is released into the atmosphere.
The balloon over the mouth of the flask captured the _______ causing the balloon to
expand/rise.
.

Answers

ATP sugar alcohol Co2 oxygen

Can anyone do a summary about any New York Times Article. It needs to be a Science article. 3 paragraph minimum. Thanks

Answers

Answer:

In the New York Times article, "The Search for Life on Venus," by Kenneth Chang, the author explores the possibility of life on Venus, the second planet from the sun. In this article, Chang examines the various theories surrounding the possibility of life on Venus, including the potential for habitable clouds in the planet's atmosphere. He also discusses the potential for future exploration of Venus, including the possibility of sending a robotic spacecraft to the planet's surface.

Chang explains that the conditions on Venus are hostile to life, with temperatures reaching up to 860 degrees Fahrenheit and a crushing atmospheric pressure 90 times that of Earth's. However, the clouds of Venus may be a more hospitable environment, with temperatures ranging from 40 to 80 degrees Fahrenheit and a pressure closer to that of Earth's. This has led some scientists to speculate that microbial life may exist in these clouds.

In conclusion, Chang's article provides an interesting overview of the possibility of life on Venus. While the surface of Venus is too hostile for life, the clouds may provide an environment where life could exist. Future exploration of Venus may help to answer the question of whether life exists on the planet.

Explanation:

Mindy notices that her cat is having trouble urinating. The veterinarian suspects Mindy's cat has a urinary tract infection. Which body system does
this disease affect?
O A.
endocrine
OB. excretory
OC. respiratory
O D. circulatory

Answers

Answer:

The answer is B.excretory

If the DNA is TTA convert into mRna and then into tRNA

Answers

Explanation:

uuA please can you send me the invoice for

Identify the type of macromolecule (carbohydrate, lipid, nucleic acid,
protein) that changes when Glu changes to Asp. Explain your answer.

Answers

Answer: The type of macromolecule that changes when Glu changes to Asp is a protein.

Explanation: The type of macromolecule that changes when Glu changes to Asp is a protein. This is because proteins are made up of long chains of amino acids, which are the building blocks of proteins. Glu and Asp are both amino acids, and they can be incorporated into a protein chain during protein synthesis. When Glu changes to Asp, it means that one of the amino acids in the protein chain has been replaced by a different amino acid. This can potentially alter the structure and function of the protein, depending on the specific role that the amino acid plays within the protein.

1. Which image shows a virus that can infect
the human body?

Answers

Answer: c

Explanation:

a is mitochondria which is part of the cell

b is the cell itself

c is the virus

d is a nerve

The occipital lobe processes visual information. The temporal lobe helps process hearing and memory. And the parietal lobe helps the brain process different stimuli, like pressure, temperature, and pain. What can you conclude about our brains based on this information?

A) One major function of the brain is making sense of different stimuli coming in from the outside world.
B) The most important thing that the brain does is organize our memories by time so that we can quickly recall them.
C) Brain activity is only concerned with things happening inside the human body, not outside in the larger world.
D) The first step in processing sound occurs in the occipital lobe, where the sound is processed and organized.

Answers

For instance, while the occipital lobe is crucial to visual processing, both sides also need portions of the parietal, temporal, and frontal lobes to handle complicated visual inputs. Thus, option D is correct.

What combine role of occipital lobe and temporal lobe?

Below the lingual gyrus, the fusiform gyrus projects from the temporal lobe. The occipital lobe is the area of the brain responsible for processing vision. It is linked to memory formation, object and face identification, colour perception, distance and depth perception, and visuospatial processing.

Although each lobe is said to have a particular purpose, most tasks call for the cooperation of several regions across both hemispheres.

Therefore, The first step in processing sound occurs in the occipital lobe, where the sound is processed and organized.

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Which of the following incorrectly matches the term with its location?

Answers

The incorrectly matched term is “Genes are located in a nucleotide”.  

Deoxyribonucleic acid, also known as DNA, is what gives living things their genetic makeup

These DNA structures are found in the cell's chromosome, which is housed in the nucleus of the cell.

The gene, which is made up of two strands of DNA, is the main heritable component. The nucleotide sequence that makes up the gene is unique.

what are Genes?

The fundamental structural and operational component of heredity is a gene. DNA is the component of genes. Some genes serve as blueprints for the synthesis of proteins. Many genes do not, however, code for proteins. A few hundred DNA bases to more than 2 million bases make up a gene in a human.

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complete question

Which of the following incorrectly matches the term with its location

DNA is found in a chromosome.

Chromosomes are found in the nucleus of a cell.

Genes are located in a nucleotide.

Nitrogen bases are located in the central rungs of a DNA ladder.

the illustration shows a model of the transport of soute particles from outside the cell to inside the cell. what type of cell transport is modeled

Answers

Answer:

The illustration shows a model of the active transport of solute particles from outside the cell to inside the cell.

Explanation:

Active Transport is defined as a process involving the movement of molecules from a region of lower concentration to a region of higher concentration against a gradient or an obstacle with the use of external energy.

This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.

An example is the phagocytosis of bacteria by Macrophages.

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examples for classification ​

Answers

Answer: Here are a few examples of classification:

Explanation:

Organizing a library's books by genre (e.g. fiction, non-fiction, children's books, etc.)

Sorting clothing items by size (e.g. small, medium, large)

Grouping types of food based on their ingredients or cooking methods (e.g. vegetarian, vegan, gluten-free)

Given the following DNA sequence, give the complementary strand: 5' A G T A T C C G T T A C 3'

Answers

3’ T C A T A G G C A A T G 5’

why the birds fly on v-formation

Answers

Answer:

There are two reasons birds might fly in a V formation: It may make flight easier, or they're simply following the leader.

Ms. King's class is planning an experiment to find out the average number of sunny days per week this October for their city.

Answers

Use a graph if that is the answer you are looking for. Or use the data they find and put that on the graph or how many cloudy days vs sunny days or rainy days

what sensors in the past points out the similarity between parthenogenesis and sexual reproduction

Answers

The similarity between parthenogenesis and sexual reproduction is “Parthenogenesis involves the formation of a zygote”

How is parthenogenesis similar to sexual reproduction?

This method is alike to the fusion of an egg and sperm in sexual reproduction since it shapes a diploid nucleus from the fusion of two dissimilar cells. The resulting offspring is a homozygote and gets about half of its mother's genetic disparity. This type of parthenogenesis could make either a female or a male.

Komodo dragons are a sample of a species that can produce offspring both through sexual reproduction and parthenogenesis.

So we can conclude that Parthenogenesis in humans never make viable embryos,

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How fast does evolution occur?

Question 1 options:

From one generation to the next

After multiple generations

Immediately

Answers

Answer:

It takes a million generations or more to evolve lasting changes, a study found

Explanation:

the answer would probably be a after multiple generations

Part
A
Fill in the table using credible sources and your own experiences and past observations. If you're not sure what one of the
characteristics means, look it up on a credible website

Answers

A source is trustworthy if it was written by a subject matter expert, is error-free, and is objective.

How do I know if a source is credible?

Peer-reviewed publications, governmental entities, think tanks for scientific study, and trade associations are examples of reliable sources. Due to their strict publishing standards, major newspapers and magazines also offer trustworthy information.

A reliable source is one that was authored without bias or inaccuracies by a subject matter expert in the field. This manual outlines the distinctions among reliable, scholarly, and peer-reviewed sources.

Take note of the three letters that follow the domain name, such as "edu," "gov," "org," and "com," which indicate the site is an educational, governmental, or nonprofit entity (commercial). Websites with the. gov and. edu extensions are typically trustworthy, but watch out for sites that are trying to trick you.

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answer is given from edmentum

is there an impact on the environment if blue whales went extinct? Who or what would it impact?

Answers

Without whales, krill would probably consume a large portion of the free-floating phytoplankton on the ocean's surface, accelerating climate change noticeably.

What makes the blue whale significant in terms of the environment?

Although blue whales have a huge food need, the ocean environment benefits from them rather than being burdened by them. Their iron-rich excrement is a crucial supply of nutrients for the marine food web, boosting production in the Southern Ocean and increasing fisheries yields.

What impact does blue whale extinction have on biodiversity?

The food source for many animals in the marine ecosystem is the carcasses of whales. The disappearance of whales would deprive other marine species of nutrients, which will have an impact on all species in the ocean.

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HELP LIMITED TIME!!!!!!!!!!!!!!!
Hydrogen fuel cells, biodiesel, and long-term electric batteries are
potential solutions to
Select one:

1, carbon sequestration

2, replacing coal as a major fuel for generating electricity

3, cap-and-trade emission control

4, reducing carbon emissions from cars and trucks

Answers

Answer: 4

Explanation:

Who is promotor of binomial system of nomenclature

Answers

Answer: Linnaeus

Explanation: Linnaeus established the practice of binomial nomenclature—that is, the denomination of each kind of plant by two words, the genus name and the specific name, as Rosa canina, the dog rose.

Genetics have observed that fruit flies that commonly inherit vestigial wing’s also lobed eyes. Observations such as this have helped to develop the genetic concept known as?

Answers

They have a receive trate

Why is PTC important to be passed on in animals and humans?

Answers

Answer:

PTC (phenylthiocarbamide) is important to be passed on in animals and humans because it is a gene that determines the ability to taste certain bitter compounds. This gene helps to determine which foods are safe to eat, as some bitter compounds are toxic and can be dangerous if consumed.

Explanation:

Civil engineers conducted a land survey in a hilly region, where roads were carved out between steep hillside slopes. Complete the passage to reveal the engineers’ safety recommendations for the area. The engineers noted that the area was prone to rockfalls and landslides. They proposed a plan to secure the rocky hillside slopes using . They also advised their team that if the slopes are not stabilized, could cause damaging mass movement without warning.

Answers

Mass wasting is movement of rock and soil down the hill. The rocky hillside slopes can be secured by slope reinforcement. if the slopes are not stabilized, landslide can cause damage.

What do you mean by mass wasting?

Mass wasting is the movement of rock and soil down slope under the influence of gravity. Rock falls, slumps, and debris flows are all examples of mass wasting. Often lubricated by rainfall or agitated by seismic activity.

The most common types of mass wasting are slumps, rockslides, debris flows, and earthflow. Slumps are slow and short-distance downslope movements of semi-consolidated earth material on a curved or planar sliding surface.

The most destructive type of mass movement is a landslide, which occurs when rock and soil slide quickly down a steep slope. Some landslides may contain huge masses of rock, while others may contain only a small amount of rock and soil.

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Answer:

wire mesh and bolts, gravity

Explanation:

Civil engineers conducted a land survey in a hilly region, where roads were carved out between steep hillside slopes. Complete the passage to reveal the engineers’ safety recommendations for the area.

The engineers noted that the area was prone to rockfalls and landslides. They proposed a plan to secure the rocky hillside slopes using wire mesh and bolts.They also advised their team that if the slopes are not stabilized, Gravity. could cause damaging mass movement without warning.

which statement correctly describes how the destiny and temperature air are related ?

Answers

Depending on the temperature the air density could be higher or lower

Which statement best describes a spring?

•the top of the saturated zone

•an underground layer of rock or sediment that holds groundwater

•groundwater flowing naturally to the surface where it is lower than the water table

•a vent in Earth's surface that periodically ejects a column of hot water and steam

Answers

Answer:

groundwater flowing naturally to the surface where it is lower than the water table

Explanation:

Answer:

c

Explanation:

Can someone help me with this

Answers

Answer: NO SORRY

Explanation:

Inventions Promote Change
4. How did the harnessing of electricity transform American business?

Answers

Around 1900, organizational and technological advancements in electricity sparked a new industrial revolution. The appearance of enterprises and cities was altered by electrical illumination and motors.

Businesses were able to expand their locations and increase their productivity thanks to centrally produced electricity. These accomplishments depended on the development of massive interconnected systems, most of which were monopolies controlled by corporations.

Before the war, the electricity business grew slowly, but in the 1920s it truly took off and played a significant role in the economic growth.

It offered factories a low-cost, effective source of power. It allowed for the simultaneous use of numerous sophisticated machines, paving the way for the development of mass production methods.

Because it provided the power required in consumers' homes for the new mass-produced goods, such as vacuum cleaners, refrigerators, and washing machines, electricity also contributed to the economic boom.

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In the feedback loop the integrating center sends information to the

Answers

In the feedback loop, the integrating center sends information to the effector.

What is the process of the feedback loop?

The process of the feedback loop makes reference to a natural mechanism in which the outcome of a given biological process feeds the entry in the system and thus generates a cycle where products are also used to initiate the process.

Therefore, with this data, we can see that the process of the feedback loop requires the presence of an effector which receives the output and converts it into the input.

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The incidence of cystic fibrosis, a recessive genetic disorder in the Caucasian population of United States, is 1 in every 2,500 individuals. Find the number of heterozygous carriers.
(p + q = 1, p2 + 2pq + q2 = 1)

A.
0.0392
B.
0.0254
C.
0.045

Answers

The  number of heterozygous carriers for a recessive genetic disorder in the Caucasian population of United States is 0.0392, option A.

How to find heterozygous carriers?

In genetics, heterozygous means having inherited different versions (alleles) of a genomic marker from each biological parent. As a result, a person who is heterozygous for a genomic marker has two distinct versions of that marker.

Using the formula p + q = 1, p2 + 2pq + q2 = 1,

The allele frequency, p² = 1/2500 = 0.0004

√p² = √0.0004

p = 0.02

substituting p in the formula p + q = 1,

0.02 + q = 1,

q = 1 - 0.02 = 0.98

Frequency of heterozygous individuals = 2pq

2(0.02 x 0.98) = 0.0392

With the application of Weinberg theorem, p2 + 2pq + q2 = 1, the frequency allele of heterozygous carriers is 0.0392.

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17. If most other species on Earth aren't monogamous, why are humans expected to be?

Answers

Many species are. Specifically, those species in which the male invests a significant amount of energy and time in providing for the offspring (rather than just fertilizing the female’s eggs and leaving). Humans definitely fall into the category. However, humans (like other monogamous animals) display what is called a “mixed strategy,” whereby each member of the pair tries to monopolize the parental investment of the other parent (to improve the chances for survival of their own offspring) while also remaining alert to (for males) sexual/reproductive opportunities with other females, or (for females) the chance to get resources (in the form of food, protection, etc.) from other males.

Of course, human cultural developments over thousands of years have shaped many variations on this basic theme. But the basic underlying logic remains the same. As evolutionary biologist Lynne Saxon put it, “monogamy is a compromise in which the winners are the offspring.”

That said, monogamy is by no means the rule across our entire species. In fact, a majority of societies around the world at least ALLOW men to have more than one wife. (A few allow women to have more than one husband.) The societies that allow for polygamy tend to be smaller than the ones where monogamy is the ideal, leading to a mistaken impression that our whole species is monogamous. But in fact, humans have devised a number of different sexual/reproductive strategies, across different cultural settings. Often it’s monogamy, for the simple reason that monogamy usually gives children the best chance of survival.
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