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mass extinction event of 65 million years ago, in which about 85% of all species on Earth died out. This extinction marked the disappearance of the dinosaurs.
the breaking down of large, complex food particles into smaller, soluble molecules which can be...
the liquid produced by the kidneys consisting mainly of water and nitrogenous wastes such as...
regions or bundles of vascular tissue consisting of xylem and phloem separated by cambium.
(also called secondary meristems) regions of cells capable of dividing to form new cells in the...