1
Animals that do not have a vertebral column or a backbone
2
Animals that have a vertebral column or backkbone
3
Respiratory organs in insects.
4
A group of vertebrates that have hair and feed their young with milk
5
the respiratoty organs in fish,, aquatic mollusc and some amphibians.
6
A group of vertebrates that have wings and most of them can fly.
7
Two sponge organs that are the respiratory organs in most of vertebrates
8
Animals that live in water or moist environment breathe through...
