The Origin of Species by Means of Natural Selection: Or, The Preservation of Favored Races in the Struggle for Life and The Descent of Man and Selection in Relation to Sex |
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acquired allied apes appear beak beautiful become bees believe birds breeds cause cells characters civilised closely colour common confined crossed crustaceans degree descended developed distinct species domestic doubt eggs existing extinct extremely fact favourable feathers females fertilised fertility fishes formation forms Fritz Müller genera genus geological gradations greater number groups habits Hence hybrids hybrids produced important individuals inhabitants inherited insects instance instincts intermediate islands kind larvæ latter Lepidoptera less likewise living lower animals Malay Archipelago males mammæ mammals manner Marsupials modified monkeys natural selection naturalists nearly nest observed ocelli offspring organs ornaments parent perfect period pigeons plants pollen present probably produced progenitor quadrupeds races reciprocal crosses relation remarks resemble rudimentary seeds sexes sexual selection shew slight South America stamens sterility stridulating structure suppose tail tion variable variations varieties various vary whilst whole widely wings young