Invertebrates - Do not have a backbone, Vertebrates - Have a backbone, Mammals - Have hair, give birth to live young, produce milk, Fish - Have gills, are adapted to life under water, Animals - Complex, multi-cellular organisms that are unable to produce their own food and must obtain it from other organisms., Plants - Complex, multi-cellular organisms that produce their own food by photosynthesis, Reptiles - Have dry scales, are cold-blooded, lay leathery-shelled eggs, Amphibians - Have moist skin, are cold blooded, spend the first part of their life under water and the later part on land, Birds - Have feathers, lay hard-shelled eggs,

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