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science

Charlie Burke Inglés 6 fichas

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1Mammals1. Mammals are endothermic vertebrates.
2. They have hair, which varies greatly among species.
2Aves1. Birds are endothermic vertebrates.
2. Their skin is covered with feathers.
3. They have four-chambered hearts.
4. They lay eggs.
3Reptiles1. Reptiles are ectothermic vertebrates.
2. Their skin has scales, but no hair or feathers.
3. They have three-chambered hearts
4Amphibians1. Amphibians are ectothermic vertebrates.
2. Their skin lacks scales, hair, and feathers, and is either smooth or rough.
3. They have three-chambered hearts.
4. They lack claws on their toes.
5Pisces1. Fish are ectothermic, aquatic vertebrates.
2. Their skin is generally covered with scales.
3. Their limbs are modified into fins for swimming.
4. They breathe with gills.
5. They lay eggs that must be in water
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