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the deepest part of the ocean.
a form of environmentally-friendly farming in which farmland and soil are cared for so that it...
small groups of cells found in the pancreas that secrete the hormones insulin and glucagon.
the very cold zone in an ocean, dam or a lake, located below the range of effective light...
a social structure in which different classes are determined by heredity.
structure surrounding plan tcells i tgives cells rigidity and strength.