The Evolution of Living Organisms |
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acquired action adapted adaptive radiation ancestor ANCYLOPODA animals and plants appear beans become birds breed true cells centrosomes changes characters chemical chromatin colour complex compounds Condylarthra continue Crocodilia Darwin definite depends developed differentiated directions disease divergence elimination energy environment Eocene evolution extinct factors of inheritance female fertilisation flowers forms gametes germ-cells germinal constitution give rise groups heliotropic herbivorous hereditary factors heredity heterozygotes homozygote hybrid important inorganic insects instance isms isolation kind large number Litopterna living matter living organisms male mammals mean weight mental metabolism modifications multicellular mutations natural selection non-living nucleus occur offspring original ovum parasitic parent Phylogeny physico-chemical processes plants and animals present primitive Proboscidea produced proteins protoplasm reappear reproduction reptiles resemblance result sexual reproduction sexual selection shown specialised species stimulus strains structure struggle for existence survive take place tall theory tion tissues transmitted tropisms useless variation varieties various vary vertebrates whole zygotes