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Holly Ratliff July 5 2000 Beckley English 2 Animal Species Living creatures on Earth need three basic things in order to survive the ability to eat breath and reproduce All animals are able to do so Animals are divided into species among these species are Mammals Reptiles Arthropods and Aves Mammals also known as Mammalia come from Latin meaning mamma breast They are called this due to the fact that Mammals are the only animals which have mammary glands which enable them to nourish their young solely on milk secreted from these glands Mammals are warm blooded and all except for marine mammals are mostly or completely covered with hair Mammals give birth to live young however there are a few rare exceptions to this rule A few mammals such as the platypus lay eggs instead of having live young Yet once the eggs are hatched the females do have mammary glands and produce milk for their young Another feature of mammals is that their heart has four chambers and a muscular diaphragm that separates their chest and abdominal cavity The mammal class includes Dogs cats horses beavers dolphins bats and humans Another animal species are Reptiles also known as Reptil which is Latin for Reptus meaning to crawl Reptiles are usually hairless with dry scaly skin They are cold-blooded which means in order for them to maintain a stable body temperature they must be exposed to some heat source such as the sun or a rock warmed by the heat of the day Due to the need for warmth Reptiles are naturally found in warm dry climates All reptiles except for snakes have low slung bodies with long tails balanced on four awkwardly small limbs Although there are a few aquatic Reptiles Reptiles who live mainly in water they all must come up to the surface for oxygen Reptiles do not give birth to live young Instead they lay eggs on
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