1. Sharks
... teeth, jaws, skin and sensory systems. They can see, hear, smell, navigate and detect even hidden prey. Unlike the bony fishes that rely on external fertilization (the female ejects thousands of small eggs to be fertilized outside the body by males), all sharks accomplish this by internal fertilization. The process of internal fertilization involves highly developed internal and external reproductive organs. They ... , may open and shut quite rapidly. In contrast to mammals the lens cannot change in shape to focus. To what extent sharks are actually capable of focusing is not yet known, ...
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