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Homology or analogy? You have probably noticed that dolphins and sharks both have a streamlined body
shape with a triangular fin on the back and two side fins. However, the two
animals also have many differences.
| skeleton made of cartilage |
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skeleton made of bone
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| use gills to get oxygen from the water in which they swim |
go to the surface and breathe atmospheric air in through their blowholes |
| don't nurse their young |
do nurse their young |
| don't have hair |
do have hair — they are born with hair around their "noses" |
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They may share the same basic shape, but underneath their skins, sharks and dolphins are very different!
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