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Answer:
1.5 groups of vertebrates
2.fish, reptiles, mammals,Amphibians,Birds
3.2 examples of vertebrate is Mammals and reptiles
4.?
5.Animals can be classified in two main groups: vetebrates and intervertebrates The main difference between vertebrates and intervertebrates is that interbrates like insect and flatworm do not have a backbone or a spinal column. examples of vertebrates include humans,birds, and snakes.