"a perfect engine, an eating machine. It's really a miracle of evolution. All this machine does is swim and eat and make little sharks" as per Hooper in Jaws!
Yes, their biology has remained constant through 50 million years of evolution- in saltwater.
Natural selection is the process which determines the shark's evolution. It is humankind that is threatening the sharks' survival.
Hedgehogs and echidnas show convergent evolution. Despite being far apart, they ended up looking very similar. Like sharks and dolphins.
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It's called convergent evolution
Whales and Sharks are examples of coevoultion. they have very similar body shapes despite only being remotely related.
Though one is a fish and one is a mammal they both have adapted to their immediate environment. Analogous traits.
megalodon sharks, great white sharks, frilled sharks, thresher sharks, tiger sharks, sand tiger sharks, lemon sharks, bull sharks, whale sharks, basking sharks, lepord sharks,black tip sharks. there is 12.
Fish began to evolve during the Cambrian explosion around 530 million years ago. The evolution of early sharks took place in the Devonian period.
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Sharks are cartilaginous fish. Cartilaginous fish receive oxygen from water via their gills, are cold blooded, and have a skeleton consisting of cartilage, rather than bone. Mammals receive oxygen from the air via lungs, are warm blooded, and have a skeleton made of bone. Mammals also are covered in hair, rather than the scales sharks have, and produce milk for their young. Sharks are not closely related to mammals via evolution, either.