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Evolution, Lamarck, Darwin, download (54), download (55), whales evolved…
Evolution
Vocabulary
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natural selection: the process whereby organisms better adapted to their environment tend to survive and produce more offspring.
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evolution: A change in the inherited characteristics of populations from one generation to the next.
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Darwinism is a theory of biological evolution developed by the English naturalist Charles Darwin (1809–1882) and others, stating that all species of organisms arise and develop through the natural selection of small, inherited variations that increase the individual's ability to compete, survive, and reproduce.
Lamarckism, a theory of evolution based on the principle that physical changes in organisms during their lifetime—such as greater development of an organ or a part through increased use—could be transmitted to their offspring.
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whales evolved from four-legged, even-toed, hoofed (ungulate) ancestors that lived on land about 50 million years ago. Modern-day ungulates include hippopotamus, giraffe, deer, pig and cow.
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The largest extinction took place around 250 million years ago. Known as the Permian-Triassic extinction, or the Great Dying, this event saw the end of more than 90 percent of the Earth's species. Although life on Earth was nearly wiped out, the Great Dying made room for new organisms, including the first dinosaurs.
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