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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.
(also called selectively permeable membrane) a membrane which allows some substances to cross it...
the outer most layer of tightly packed modified parenchyma cells in plants.
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
the total amount of carbon dioxide produced by individuals, nations or organisations as a result...