A biologist is studying two organisms: one is a vertebrate with feathers, two legs and two wings, and is endothermic; the other is a vertebrate with smooth moist skin, lays eggs without shells in water, and is cold-blooded. Which classes do these organisms belong to?
1 )
First is a reptile; second is an amphibian
First is a bird; second is an amphibian
3 )
First is a bird; second is a fish
4 )
First is a mammal; second is a reptile
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