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a molecule that stores large amounts of energy that can be used for metabolic activity.
a non-membrane bound structure made of proteins and nucleic acids that occurs within the nucleus...
(also called the pith) the central part of the stem that consists of large, thin-walled...
water that is found on the surface of the earth, e.g. in rivers, streams, and lakes etc.
(also called pith rays) sections of the medulla that occur between the vascular bundles.