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THE NATURE AND ORIGIN OF LIFE
Life a physicochemical process in Protoplasm p 14 No special
Metaphyta and Metazoa p 28 Growth p 29 Regeneration
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A. F. W. Schimper acquired action adapted adult ancestor appear Arctic Wolf become behaviour birds breed true cells centrosome changes characters chemical chromatin colour complex compounds continuity crossing curve Darwin Diagram illustrating differentiated directions divergence Divergent evolution division domestic races dominant Drosophila environment Eocene evolution external extinct factors of inheritance female fertilization fission forms gametes germ germ-cells germ-plasm germinal constitution give rise groups hereditary heredity heterozygote homozygote hybrid important individuals insects instance instincts kind large number living matter living organisms male mammals mean metabolism modifications mutation natural selection notochord nucleus number of chromosomes occur offspring original ovum parasitic parent phylogeny physico-chemical processes primitive produced proteins protoplasm reappear reproduction reptiles response result sexual sexual selection shown skull species spermatozoa stage stimulus structure struggle for existence substance survive T. H. Morgan take place tall theory tion tissues transmitted Ungulata variation various vertebrates zygote