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HOW HAS MAN BEEN MADE?
EVOLUTION A REVOLUTIONARY DOCTRINE
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able activity advance already amount animals appearance atom attain average basis become behavior better biological body brain carried cause cell changes characteristics characters chemical combined complete consider considerable continue co÷peration cord course defective dependent desirable determine differences direction economic effects energy eugenic eventually evolution existence fact forms further future genes genetic give given greater growing hand happiness Hence hereditary higher human ideals important improvement individual intelligence interests invention kind knowledge less limited living material matter means mental methods multiply mutations nature occur organization original past persons physical population possible practically present problem progress question race reason regard reproduction result selection sense social society space species structure struggle tend things thought tion traits true universe various whole