animals with backbones that can be classified according to their feautures
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types of vertebrates
bony fish, amphibians, reptiles, birds and mammals
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bony fish
absorb oxygen through their gills & they have wet scales --> their body temperature varies according to surroundings --> bony fish reproduce via external fertilisation e.g they lay eggs
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amphibians
usually have lungs BUT they can also absorb 02 through their moist skin--> body temperature rises with surroundings --> they lay eggs via external fertilisation
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reptiles
have lungs and dry scales--> body temperature changes with surroundings--> internal fertilisation and they lay eggs
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birds
-->lungs, feathers and beaks-->can mantain body temperature (HOMEOTHERMS)--> internal fertilisation and lay eggs
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mammals
---> lungs and fur --> homeotherms--> internal fertilisation and give birth to live young (VIPAROUS)
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