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Oxygen absorption
Fish: Gills
Amphibians, birds, mammals, reptiles: lungs
Reproduction
Mammals: viviparous
Birds, reptiles, amphibians, fish: oviparous
Thermoregulation
Mammals, birds: homeotherm
Reptiles, amphibians, fish: poikilotherm
Fertilisation
Reptiles, birds, mammals: internal
Fish, amphibians: external
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