Why do some vertebrates appear to fit into two or more different classes?

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asked Sep 14, 2018 21.8k views

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Ian Hunter · Answer 1 · 2018-09-20T13:46:55+0000

All vertebrates are, by nature, in two classes : the male class and the female class. Only some invertebrates like the earthworm, water snail etc are in single class with both male and female organs in the same body.

Why do some vertebrates appear to fit into two or more different classes?

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