A(n)____________________ is a significant increase in extinction rates above the background level.
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Q66: Large regions such as forests,deserts,and grasslands,with distinct
Q67: Species that migrate into,or that are deliberately
Q68: The loss of a(n)_ species can lead
Q69: The number of species on the planet
Q70: Species that are only found in one
Q72: In geologic history,mass extinctions have been followed
Q73: The world's entire body of discovered fossils
Q74: Keystone species have a large effect on
Q75: A temperate rain forest is likely to
Q76: Charles Darwin and _ both came up
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