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One Long Argument
Difficulties on Theory
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advantage Alfred Russel Wallace amphibians animals argued argument from design attributes behaviour biological birds breed Cambrian chapter Charles Darwin chimps closely related common ancestor competition creationists Darwin's argument Darwin's second Darwin's theory Darwinian Descent discussion distinct emotional expression evidence evolutionary change evolved by natural example existence explain adaptation extinct female choice fertility formations forms fossil record genes genetic geological human hybrid sterility idea individual instance inter-fertile interbreeding junk DNA kin selection kind light-sensitive cells look males mammals Mark Ridley mate million years ago modern biologists moral muscles natural selection non-human offspring organ Origin of Species Palaeozoic pollen population Precambrian principle of divergence problem produce quoted passage readers reproduction reptiles rocks seeds self-sacrifice sense separately created serviceable associated habits sexual selection Silurian social stages structure survive tend theory of evolution theory of natural thought tion topic tribe trilobites variation varieties woodpecker writing