Biology for IGCSE & O level - Characteristics And Classification Of Living Organisms (Section 5 - No. 40)
Which class of vertebrates is characterized by being cold-blooded and laying eggs, but spending a portion of their lives in water?
Mammals
Birds
Reptiles
Amphibians
Explanation
Amphibians start life in water, have gills at first, and as adults they can live both on land and in water
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