Internal fertilization and internal development of the fetus
no they do not
kinkajous are laughing mammals
gills
they just do ok it happens for a reason go look it up on yahoo answer
buhb
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The unique traits that helped mammals survive are called adaptations. Some of their adaptations include their hair, mammary glands, and three specialized middle-ear bones.
angel + anton aa
There prey help them , there fur. And there smell and hearing
hibernation, thick fur, fat storage, etc.
Most mammals are placental. In Australia, however, almost all mammals are marsupials.
The answer is A) live in different environments