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That question is analogous to asking why did some fish grow legs and become mammals. The answer is mutations sometimes specific members of a group will gain a
by dyauspitr 1y ago
That question is analogous to asking why did some fish grow legs and become mammals.
The answer is mutations sometimes specific members of a group will gain a mutation that will overtime cause that group to split off away from the ancestor group. It’s all a matter of chance evolution doesn’t have a direction.
- WalterBright 1y agoMultiple lines of mammals have independently evolved back into being marine life. Whales, seals and manatees do not have a common ancestor, for example.
- mouse_8b 1y agoThey do have a common ancestor, it's just not a marine mammal.
- WalterBright 1y ago> not a marine mammal which is the point. They were not evolved from the same species of land animal.