2 years ago

How do acquired characteristics differ from adaptations

1 answer:

5 0

Answer:

acquired traits are traits that organisms develops over a lifetime. adaptation are trait that enhances an organism's ability to survive and reproduce in its environment.

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3 years ago

How many protons and neutrons does Polonium-211 have?

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Neutrons: 127

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Watershed
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3 years ago

The radioactive element carbon-14 has a half-life of 5750 years. a scientist determined that the bones from a mastodon had los

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Radioactive elements obey 1st order kinetics,

For 1st order reaction, relation between rate constant (k) and half life [t(1/2)] is,
k = $\frac{0.693}{t(1/2)} = \frac{0.693}{5750} = 1.205 X 10^-^4 hr^-^1$

Also, for 1st order reaction, we have
t = $\frac{2.303}{k} log \frac{\text{initial conc.}}{\text{final conc.}}$

Given that: <span>the bones from a mastodon had lost 78.5% of their C14,
</span>∴ initial conc. of C14 = 100%, conc. of C14 left after time 't' = 21.5%

∴t = $\frac{2.303}{1.205 X 10^(-4)} log \frac{\text{100}}{\text{21.5}}$ = 1.2758 X 10^4 hours

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2 years ago