Answer:
You take any of the "signs of change in populations of organisms and their environments". For imagine, Australopithecus (early man) turning to Homo sapiens. In that way they could tell that you took this journey.
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PCR is a useful technique because it is used to amplify small segments of DNA.
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Answer:
The anus is an opening at the far-end of the digestive tract and is the exit point for the waste material.
Explanation:
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