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Many snakes that belong to the viper family are unusual in that they give birth to live young.

This is usually a characteristic of which vertebrate group?
A amphibians
B birds
C bony fish
D mammals

User Heidi
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Answer: Mammals

Explanation: Mammals almost always give birth to live young. Birds, amphibians, and bony fish, however, usually do not.

User Nishith
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