Question

Which evidence supports the theory that fish and mammals evolve from the same ancestor

Answer 1

1. Genetic similarities: Studies of the genetic code of different fish and mammal species have revealed many shared genes and genetic sequences, indicating a common ancestry.

2. Vestigial structures: Both fish and mammals possess vestigial structures, such as the pelvic girdle in certain fish species and the remnants of hind limbs in some whale species, which suggest a shared evolutionary history.

3. Fossil evidence: Fossils of ancient fish species and early mammal ancestors show transitional forms that exhibit characteristics of both groups, providing a clear link between the two.

4. Developmental similarities: Both fish and mammals undergo similar embryonic development processes, such as the formation of gill slits in fish embryos and the presence of a notochord in both groups, further supporting a common evolutionary origin.

5. Biochemical evidence: Comparative studies of proteins and other biochemical molecules in fish and mammals show similar patterns of evolution and divergence, indicating a shared evolutionary trajectory.