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the hygienic removal of human waste.
small, non-pigmented plastids that occur in roots and non-photosynthetic tissues of plants. They...
(also called caustic soda) a white solid, available in pellets, flakes or granules, with the...
(also called polymers) large, more complex molecules formed when monomers join together.
the process whereby nutrients that have been absorbed from the digestive system are taken up by...