Question

How are fossils useful to us in learning about our ancestors

Answer 1

fossils were remained in soil for many year & it remained our ancestor because fossils were remained generation after generation which remained our ancestors.
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Answer 2

Fossils useful in learning about our ancestors:

Fossils are the remaining of the old material of our ancestors. Fossils helps us to learn about the ancestors of million years ago. Fossils are the actually the remaining of the actual body parts like bones or skeleton or footprints and traces of the body etc.  

Harder part or harder tissue of the body can be preserved as a fossils rather than softer tissue. Softer tissue can be eaten by the animals or can be damaged due to the decay so the harder shell can be changed to fossils.