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a form of environmentally-friendly farming in which farmland and soil are cared for so that it stays productive and does not damage the environment.
three pairs of exocrine glands which secrete saliva into the mouth.
the kingdom of multicellular organisms that contain chlorophyll and make their own food by...
the formation of layers of water of different temperatures in large bodies of water - dams,...
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...