Why do marine mammals sway their tails vertically, while fish sway them horizontally?
In: Biology
Mammals that live in the sea evolved from land mammals, which means that they are similar to land mammals. You are a land mammal. If you tied your legs together and laid on your stomach, would it be easier for you to move them side to side or up and down? Up and down, right? Since water mammals have similar bones to you, it’s also easier for them to move up and down.
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