來寫寫演化學的翻譯吧!
One of the classical examples of evolution occurs on the Galapagos Islands
with Darwin’s finches. The islands have always been separate from the South
American mainland and vary in size and elevation. The lowlands are covered
with thorn scrub, while higher elevations (found only on the larger islands)
are covered with moist, dense forests. All the organisms living on these
islands are descendants of species that have emigrated there, primarily
from South America. In studying the finch populations, researchers have
identified fourteen species, none of which are found on the mainland.
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