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The following outline is provided as an overview of and topical guide to zoology: . Zoology – study of animals.Zoology, or "animal biology", is the branch of biology that relates to the animal kingdom, including the identification, structure, embryology, evolution, classification, habits, and distribution of all animals, both living and extinct, and how they interact with their ecosystems.
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General features: morphology (biology) – anatomy – physiology – biological tissues – organ (biology) – organ systems; Water and salt balance Body fluids: osmotic pressure – ionic composition – volume. Diffusion – osmosis) – Tonicity – sodium – potassium – calcium – chloride; Excretion; Nutrition and digestion
EDGE species are species which have an above average ED score and are threatened with extinction (critically endangered, endangered or vulnerable). There are currently 564 EDGE mammal species (≈12% of the total). Potential EDGE species are those with high ED scores but whose conservation status is unclear (data deficient or not evaluated).
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