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damage caused to the vegetation when it is intensively fed upon by grazing animals and does not have the chance to regrow or recover.
three pairs of exocrine glands which secrete saliva into the mouth.
an abnormal response of the immune system to the protein in certain foods.
the movement of molecules across a membrane against the concentration gradient, from an area of...
bacteria that convert nitrogen in the air into compounds such as nitrites, nitrates and ammonia...