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mass extinction event of 250 million years ago, in which about 90% of all species on Earth died out. It included a mass extinction of insects.
a fine thread-like structure. In plants: the stalk of the male sexual organ.
a system of veins which carries blood from the digestive tract to the liver.
the forming new plants asexually (without the production of seeds or spores).
the gradual wasting away of the body caused by severe malnutrition, in the form of inadequate...
a tail-like structure that some prokaryotic and eukaryotic cells use for movement.