Answer:
B
Explanation:
We have learned of a major population crisis in China. Whereas The united states of America has the slowest population growth.
Well from what I know their bodies start to decompose.
<span>One group is given a larger dosage than is typically prescribed.
A second group is given a smaller dosage than is typically prescribed
Then results of the groups are compared to each other.
The thing that is missing in this experimental design is a third group who are tested with the typical dosage.</span>
the correct answer you are looking for would be letter B. formation of geological layers
hope this helps :)