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1. 
Vertebrates are divided into five groups: Mammals, birds, reptiles, amphibians and...
2. 
Birds have their bodies except for their legs covered with...
3. 
How do fish breathe through?
4. 
Birds don't have teeth, they have a ... instead.
5. 
Why are mammals viviparous?
6. 
Birds, reptiles, amphibians and fish are oviparous because...
7. 
Young amphibians are different from adults because the go through a process called...
8. 
Amphibians breathe through their skin and through ...
9. 
Where do fish lay the eggs?
10. 
What vertebrates look after their young?