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An important challenge to traditional (pre-1860) ideas about species was the observation that seemingly dissimilar organisms, such as hummingbirds, humans, and whales, have similar skeletal structures. this most directly suggested to biologists that view available hint(s) an important challenge to traditional (pre-1860) ideas about species was the observation that seemingly dissimilar organisms, such as hummingbirds, humans, and whales, have similar skeletal structures. this most directly suggested to biologists that these seemingly dissimilar organisms might have evolved from a distant, common ancestor advantageous changes can be passed along to offspring only the best-adapted organisms can survive most evolution occurs rapidly following a mass extinction.
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An important challenge to traditional (pre-1860) ideas about species was the observation that seemin...
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