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(also called an extinction event) the sudden dying out of large number of species over a short period of geological time.
the trapping of the sun's heat energy by certain gases in the atmosphere, e.g. carbon dioxide...
a large tongue-shaped organ in the mammalian body which secretes hormones and digestive enzymes...
a molecule that is formed when oxygen and haemoglobin combine chemically.
a genus of the Protozoa consisting of shapeless unicellular organisms that move by means...