They look incredibly different to you or me, but surprisingly, we share much of the same internal anatomy with fish. The main ...

A defining characteristic of the cuttlefish, the cuttlebone is a porous internal shell that helps control buoyancy, making it functionally similar to swim bladders in fish. Cuttlebones have both ...

Internal fertilization ... fish have various breeding strategies. Fish anatomy reveals that these unique aquatic creatures reproduce sexually by producing and fertilizing eggs and sperm.