Invertebrates, Do not have a backbone., Vertebrates, Have a backbone., Mammals, Have hair or fur, are warm blooded, give birth to live young, produce milk., Fish, Have fins, have gills to breathe under water, are covered with scales, live in water, are cold-blooded and usually lay eggs, 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 scaly skin, breathe air, are cold-blooded and usually lay leathery-shelled eggs., Amphibians, Have moist scaleless skin, are cold blooded, live on land and in water, lay eggs and breath oxygen through their lungs., Birds, Have feathers, two legs, two wings lay hard-shelled eggs and are warm-blooded., Insects, Have an exoskeleton,  3 main body parts (head, thorax, abdomen),  have a pair of antennae , 3 pairs of legs and usually one or two pairs of wings.

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