Animals

Chia sẻ: Nguyen Van Thang | Ngày: | Loại File: DOC | Số trang:49

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Animals

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All animals digest their food, carry on gas exchange, excrete waste, circulate nutrient and waste products to and from the cells, coordinate their movements, protect themselves, and reproduce and disperse the species. The more complex animals have organ systems to carry out these functions; in simple animals, these functions sometimes are carried out by specialized tissues.

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Nội dung Text: Animals

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