1
insects belong to this category
2
animals with a spinal column
3
insects have this
4
they live both on land and in water
5
these animals have to watch where they go
6
snakes belong to this category
7
words that give birth to young animals
8
birds use these to keep their body warm
9
fish have these
10
fish breathe with these
11
mammals use this to regulate their body temperature
