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compounds such as lipids, carbohydrates, proteins, nucleic acids, vitamins, petrochemicals and some plastics that contain the elements carbon and hydrogen.
undifferentiated mass of tissues that forms when small pieces of the parent plant, called...
(also called physical digestion) the breaking down of food into smaller pieces using mechanical...
the main blood vessel that returns deoxygenated blood from the head and thorax to the right...
a process of asexual reproduction in which one cell splits into two cells