Answer:
Fossils are the remain or impression of pre - historic organisms preserved in sedimentary rocks, or other media.
Two ways by which fossils provide evidences for biological evolution are as follows (i) The distribution of fossils gives an evidence of biological evolution. The early fossils present in the bottom rocks are simple, however those present in the recent rocks are more complex. It shows that fossil forms become more and more complex as we proceed from earliest (lowermost) to the recent (uppermost) rocks and support the biological evolution. (ii) The fossil organisms which show characters of two different groups are called missing links and they provide evidences of the evolution, e.g. Archaeopteryx shows reptilian and avian characters, suggesting that birds have evolved from reptilian ancestors.
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