In contrast to the australopithecines, the major members of our genus Homo -- such as erectus and the Neanderthals (Homo neanderthalensis) -- are very similar to modern humans.
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If other causes which produce purpose exist, then it's not the case that natural selection "must have built" the apparent purpose we see throughout life.
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Some proponents of the "junk" DNA argument claim that even if non-coding DNA is transcribed into RNA, that RNA might still be functionless.
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Co-discoverer of the double-helical structure of DNA, Francis Crick, once said "Biologists must constantly keep in mind that what they see was not designed, but rather evolved." Goodluck with the constant reminders.
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