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anyanavicka [17]
2 years ago
14

Yo can someone help me out

Biology
2 answers:
ankoles [38]2 years ago
5 0
i agree with c lol....
krok68 [10]2 years ago
4 0

Answer:

The answer is C.The moisture in the warm air condenses on contact with the cold air, causing rain to fall

Explanation:

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Short-term regulation of food intake involves neural signals from stretch receptors in the GI tract.
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Short-term regulation of feeding involves signals coming from the liver and GI tract. Stretch receptors send afferent signals through the vagal nerve fibers to the chemoreceptors in the stomach and proximal small intestine,

Short-term regulation food intake is primarily regulated by food signals resulting from both their preabsorptive action in the gut and their postabsorptive metabolism, as opposed to long-term food intake, which is regulated by adiposity signals. The first process, commonly referred to as short-term regulation, tries to consume enough energy to counteract what is being used up. It is typically believed that this short-term mechanism controls both the interval between meals and the amount of the meals.

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Arrange the layers and faults from oldest to youngest.
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The bones from an animal found at an archaeological dig have a C614 activity of 0.10 Bq per gram of carbon. The half-life of C61
erastova [34]

C14 is an isotope used in radiocarbon dating techniques to date organic matter remains. The age of these bones is approximately<u> 6890 years.</u>

<h3>What is Carbon 14?</h3>

Carbon 14, also known as radiocarbon, is a radioactive carbon isotope.

Isotopes are the atoms of the same element -carbon- that vary in neutrons and, hence, in their massic number. They are alternative forms of the same element.

The radioactive C14 nucleus contains 6 protons and 8 neutrons and has a half-life of 5730 years.

The term half-life is a reference. It means that an organism that has been dead for 5730 years has half the C14 amount or concentration than the same organism had when it was alive.

Knowing the half-life of an element is useful to determine the age of the dead matter.

C14 is used in radiocarbon dating techniques or methods to estimate the age of fossils. This is a reliable technique used for dating organic samples that are less than 50,000 years old.

<u>Available data</u>:

  • The half-life of C14 is 5730 years
  • Bones activity of 0.10 Bq per gram of carbon

To answer this question we can make use of the following equation

Ln (C14T₁/C14 T₀) = - λ T₁

Where,

  • C14 T₀ ⇒ Amount of carbon in a living body. We know, by bibliography, that living organism activity is 0.23 Bq per gram of carbon. So, C14 T₀ = 0.23 Bq/g
  • C14T₁ ⇒ Amount of carbon in the dead body. C14T₁ = 0.1 Bq/g
  • λ ⇒ radioactive decay constant = (Ln2)/T₀,₅
  • T₀,₅ ⇒ The half-life of carbon 14 = 5730 years
  • T₀ = Time when the organism was alive
  • T₁ = Age of bones

Let us first calculate the radioactive decay constant.

λ = (Ln2)/T₀,₅

λ = 0.693/5730

<u>λ = 0.0001209</u>

Now, let us calculate the first term in the equation

Ln (C14T₁/C14 T₀) = Ln (0.1/0.23) = Ln 0.4347 =<u> - 0.833</u>

Finally, let us replace the terms, clear the equation, and calculate the value of T₁.

Ln (C14T₁/C14 T₀) = - λ T₁

- 0.833 = - 0.0001209 x T₁

T₁ = - 0.833 / - 0.0001209

T₁ =  6889.99 ≅ <u>6890 years</u>

The bones are approximately<u> 6890 years.</u>

You can learn more about dating organic matter with carbon14 at

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6 0
2 years ago
5. Which of the following is an important factor in the formation of a fossil? 2 points
cupoosta [38]

Answer:

All of the above is the answer because they are all an important factor in the formation of a fossil.

3 0
3 years ago
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