Answer:
C. cause and effect
Explanation:
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Potassium-40 has a half life of 1.251×billion<span> years</span><span>. To determine the percentage potassium-40 remaining after 3.9 billion years, divide
3.9 by 1.251, = 3.12.
This is the number of times the original amount of potassium-40 reduces by 50%. The remaining percentage is therefore 100%/(3.12 * 2) = 16.03%.</span>
The answer is D.) all cell are composed of a membrane...
First answer: 4
Second answer: I think 2?
Third answer: 5
Fourth answer: 1
