Life and Evolution: An Introduction to General BiologyHarcourt, Brace, 1926 - Всего страниц: 449 |
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Стр. 6
... cycle in which the regenerative activities occur . With higher organisms the cyclical changes involve growth , development , and finally natural death a e and dissolution . Life leads to death as the 6 LIFE AND EVOLUTION.
... cycle in which the regenerative activities occur . With higher organisms the cyclical changes involve growth , development , and finally natural death a e and dissolution . Life leads to death as the 6 LIFE AND EVOLUTION.
Стр. 8
... activities are carried on seem to be especially fitted for their work . Our hands are wonderfully adapted for grasping and manipulating objects , our ears for hearing sounds , our lungs for carrying on the function of respiration , and ...
... activities are carried on seem to be especially fitted for their work . Our hands are wonderfully adapted for grasping and manipulating objects , our ears for hearing sounds , our lungs for carrying on the function of respiration , and ...
Стр. 9
... activities of pursuit in the hungry lion . These actions are adaptive in the sense that they assist in maintaining the life of the organism . Other acts may be serviceable in perpetuating the life of the race . For this end there are ...
... activities of pursuit in the hungry lion . These actions are adaptive in the sense that they assist in maintaining the life of the organism . Other acts may be serviceable in perpetuating the life of the race . For this end there are ...
Стр. 12
... activities are somehow controlled and directed by purpose . Life is a kind of purposive striving , bent on accomplishing its own perpetuation . It is fundamentally a teleological , or end - seeking process . Mere physics and chemistry ...
... activities are somehow controlled and directed by purpose . Life is a kind of purposive striving , bent on accomplishing its own perpetuation . It is fundamentally a teleological , or end - seeking process . Mere physics and chemistry ...
Стр. 24
... activities imposed upon the organism . As Osterhout remarks , we should “ regard the death process as a normal part of the life process , producing no disturbance unless unduly accelerated by an injurious agent which upsets the normal ...
... activities imposed upon the organism . As Osterhout remarks , we should “ regard the death process as a normal part of the life process , producing no disturbance unless unduly accelerated by an injurious agent which upsets the normal ...
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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