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can be broken down, in a reasonable amount of time, into its base compounds by micro-organisms and other living things.
a microscopic hair-like extension of the cell membrane of the epithelial cells forming the outer...
the membrane surrounding the vacuole. It is similar in structure and function to the cell...
the replacement of liver tissue by scar tissue due to damage to liver cells caused by excessive...
plant-like organisms that live and grow in water; they make their own organic food by the...
birds without a keel on their breastbones and therefore unable to fly, for example ostriches....