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The Struggle for Existence
Evolution and its Future
adapted admit advantage ages amount animals appear become believe better birds branches breed called cause chance chapter character checks climate closely common competition complex consequently continue created cross depends descendants destroyed diagram distinct divergent domestic doubt effect eggs existence extinct extremely facts favourable flower follows forms future genera genus geological give given greater groups habits hand Hence important improved increase individuals inhabitants inherited insects instance intercrossing intermediate intervals kinds laws less lines living look males manner marked means modified namely natural selection naturalists nearly occasional offspring organic original parent perfect period places plants pollen present preservation prey principle probably produced reason relations represented seeds seems severe single slight slowly species structure struggle struggle for existence successive supposed tend theory tion tree variability variations varieties vary whole widely young