Question

How comparative anatomy of animals give evidences of organic evolution?

Answer 1

1. Homologous Organs: Organs that have different functions in different species but similar embryonic origin and structure indicate a common ancestry. For example, the forelimbs of humans, wings of bats, and flippers of whales have different functions but share a similar bone structure, reflecting descent from a common ancestor.
2. Analogous Organs: Organs that perform similar functions but differ in structural origin represent adaptation to similar environments independently, showing convergent evolution.
3. Vestigial Organs: Organs that are non-functional or reduced in the current organism but were functional in ancestors (e.g., human appendix) indicate evolutionary remnants from a common lineage.
4. Connecting Links: Some organisms show traits common to two different groups, acting as evolutionary intermediates (e.g., lungfish connecting fishes and amphibians).
5. Atavism: Reappearance of ancestral traits (e.g., rudimentary tails in human babies) supports the concept of inheritance from common ancestors.