The layer of soil underneath topsoil is?

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Answer 1

Answer:

Answer:

subsoil or horizon b I hope it will help you please follow me

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Scientist can determine the age of ancient objects by a method called radiocarbon dating. The bombardment of the upper atmosphere by cosmic rays converts nitrogen to a radioactive isotope of carbon, 14C, with a half-life of about 5730 years. Vegetation absorbs carbon dioxide through the atmosphere and animal life assimilates 14C through food chains. When a plant or animal dies, it stops replacing its carbon and the amount of 14C begins to decrease through radioactive decay. Therefore, the level of radioactivity must also decay exponentially. A parchment fragment was discovered that had about 64% as much 14C radioactivity as does plant material on Earth today. Estimate the age of the parchment. (Round your answer to the nearest hundred years.) yr

Answers

Answer:

$3688.323$ years

Explanation:

Given-

Half life of $14$ C $= 5730$ years

As we know -

$A_((t)) = A_0e^(kt)$

Where

$A_((t)) =$ Mass of radioactive carbon after a time period "t"

$A_0=$ initial mass of radioactive carbon

$k =$ radioactive decay constant

$t =$ time

First we will find the value of "k"

$(1)/(2) = (1)*e^(k*5730)\n$

On solving, we get -

$e^(5730*k)= 0.5\n5730*k = ln(0.5)\nk = -0.000121$

Now, when mass of 14C becomes $64$ % of the plant material on earth today, then its age would be

$A_((t)) = A_0*e^((-0.000121*t))\nA_((t))= 0.64*A_0\n0.64*A_0 = A_0*e-^((0.000121*t))\nt = 3688.323$ years

In this activity, you will use presentation software to create a presentation of 15 to 20 slides explaining your arguments in support of or against the following statements:AIDS continues to be a global health crisis.
AIDS still meets the definition of a pandemic.

Your claims should be supported by scientifically complete evidence.
Follow the steps provided to research, plan, and create your presentation. This guide about the research process can help.

Time to complete: 2 to 3 hours

Part A: Ask Questions
Begin by creating a list of questions to guide your research and help you form a convincing argument. Your presentation should answer some of these questions:
What is the definition of a pandemic?
How does a pandemic differ from an endemic or epidemic?
What is the life cycle of the HIV virus once it enters the body? How does the genetic code
of the virus change?
How does HIV affect the body?
How do people become infected with HIV?
How does AIDS develop from an HIV infection?
What are the current infection rates of HIV across the globe?
Where is HIV/AIDS most prevalent?
What treatments are currently available for HIV/AIDS?
Do some regions of the world have better access to treatments than others?
What is the average life expectancy for someone with HIV?
Does life expectancy differ around the globe?
Now write four additional questions about HIV/AIDS that could help strengthen your argument in the presentation.

Answers

Based on the information given, a pandemic simply means the spread of an infectiousdisease.

What is HIV?

It should be noted that the difference between an epidemic and a pandemic is the degree if its spread.

HIV is simply a virus that attacks the immune system. It can be gotten through unprotected intercourse, sharing sharp objects, etc. It should be noted that in the long run, HIV leads to AIDS.

It should be noted that HIV is most prevalent in Sub Saharan Africa. There are presently no cure for HIV but there are medications to control the complications.

The average life expectancy for someone with HIV is 56 years.

Learn more about pandemic on:

brainly.com/question/19381375

We used new tags for the population estimate a year later. If we assume the tags stay on well over the year, what changes the proportion of the old marked tags in the population and make the use of new tags more accurate? (Hint: look back at the assumptions made by the mark and recapture method).a. random loss of tags might sufficiently large to change the proportion of tagged fish.

b. as tagged fish die and larvae that were not tagged reach maturity the proportion of tagged changes.

c. The fish might eat the tags.

d. we cannot assume tags would stay on longer than six months, so we need new tags for the fishfish.

Answers

Answer: Option B

Explanation:

It has been assumed that the tags remains on the body of the fishes and is not removed before a year.

The random tags of the fishes can be affected only when there is a high number of fishes born which are not tagged. The proportion of fishes can be affected in this case only.

The number of fatality can be same for both of the fishes, one which were tagged and the ones which were not tagged.

As the tagged fishes die and the larvae of fishes are also not tagged. When comparing both, there is a proportional difference in the number of fishes.

Ahmed and Fatima, two teenage siblings, are fighting over the evening newspaper. Knowing Ahmed only wants the sports section and Fatima only wants the latest stock quotations, their mother takes the paper and gives each the section containing their news of interest. In the context of mediation, the mother arrived at a(n)

Answers

Answer:

Explanation:

In business studies, an integrative agreement can be described as a situation in which all the parties benefit from an action and are in win-win situation. An integrative agreement tends to find beneficial options for both the parties at dispute so that a mutual agreement can occur between them.

In the following scenario, Ahmed and Fatima's mother provided a solution which benefited both of them. Hence, it is an example of an integrative agreement.

List planets that have rings.

Answers

Answer: Jupiter, Saturn, Uranus, and Neptune

Explanation:

The number of currently described species on the planet is about ________.17,000
150,000
1.5 million
10 million

Answers

The number of currently described species on the planet is about: C. 1.5 million.

What is a species?

A species can be defined as a biological classification of related organisms that have similar characteristics and they are capable of breeding with one another in a cycle.

Some examples of species of various organisms include the following:

Giraffa camelopardalis

Humans

Moose (Alces laces)

Black bears (Ursus americans)

Jack pines (Pinus banksiana)

In conclusion, there are currently about 1.5 million species on planet Earth.

Read more on species here: brainly.com/question/15971107

Answer:

The correct answer will be option- 1.5 million.

Explanation:

Biodiversity refers to the variety of species and ecosystem present on the earth in which they are part of it. The biodiversity comprises of three components: species diversity, ecosystem and genetic diversity.

The number of species present on this planet is found to be around 1.5 million in which 17,000 new species are being added to the existing number.

Thus, option- 1.5 million is the correct answer.

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