'Longer gestation times' presentation slideshows

7. Class - Mammalia ~4500 species in 19 orders

7. Class - Mammalia ~4500 species in 19 orders. Characteristics hairy animals with glands that produce milk maintain constant body temp. most develop in the uterus where they are nourished by a placenta limbs are under the body, directed downwards fully mobile jaw and socket teeth. Origins.

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