Question

*How can we understand what happened millions of years ago when there was no one at that time?*
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Answer 1

Answer:

How can you know what happened millions of years ago if no one was there to see it? Evidence and observation are the building blocks of all scientific inquiry; evolutionary science is no different. ... The theory of evolution puts these clues together into a cohesive explanation of the diversity of living things.

Answer 2

We understand what happened millions of years ago when there was no one at that time by the following:-

• Fossils that serve as the palentological evidence. They are the dead remains of hard parts of organisms like shells, bones, teeth, etc. in the rocks.
• Morphological and anatomical evidences- Comparing the anatomy and morphology of organisms helps to determine the differences between the present living organisms and the extinct ones.
• Embryological evidences - by performing a comparative study of the embryos of various animals.