Life and Evolution: An Introduction to General BiologyHarcourt, Brace, 1926 - Всего страниц: 449 |
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according activities adapted afford alimentary canal amount animals appearance become birds blood body called carried causes cells changes characters chromosomes closely colony color common commonly complete connected consists contains continuous cross cytoplasm disease division effect eggs embryo evidence evolution experiments fact factors female fertilized followed forms frequently function germ give glands green grow heredity higher human important individuals influence insects kinds known later layer less living lower male mammals material means natural nerve normal nucleus observed occur organisms origin pairs parasites parents pass period plants possible present primitive probably problem produced protoplasm region relation relatively remains remarkable represented result secretion selection separated sexual reproduction showing side similar single social species stage structure substance successive surface theory tion tissue usually variety various wall young