Life and Evolution: An Introduction to General BiologyHarcourt, Brace, 1926 - Всего страниц: 449 |
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Стр. 25
... species , we are naturally desirous of circumventing it as long as we can . Death is essentially a chemical phenomenon . The protoplasm of many forms may undergo marked physical changes , but so long as these do not entail too great a ...
... species , we are naturally desirous of circumventing it as long as we can . Death is essentially a chemical phenomenon . The protoplasm of many forms may undergo marked physical changes , but so long as these do not entail too great a ...
Стр. 41
... species of organism has its characteristic number of chromosomes . They vary in number from two in a species of parasitic worm ( Ascaris megalocephala var . univalens ) to considerably over a hundred . The number in man is probably ...
... species of organism has its characteristic number of chromosomes . They vary in number from two in a species of parasitic worm ( Ascaris megalocephala var . univalens ) to considerably over a hundred . The number in man is probably ...
Стр. 63
... species , form supporting skeletons , commonly of silica , which are remarkable for the beauty of their radially symmetrical structure . The Foraminifera and the Radiolaria live upon the smaller organisms which they catch with their ...
... species , form supporting skeletons , commonly of silica , which are remarkable for the beauty of their radially symmetrical structure . The Foraminifera and the Radiolaria live upon the smaller organisms which they catch with their ...
Стр. 67
... species of this group , Trypanosoma gambiense , is responsible for the sleeping sickness which is widespread among the natives of Africa . This disease , Fig . 30 – Eugleas its name implies , is characterized by symptoms na viridis , a ...
... species of this group , Trypanosoma gambiense , is responsible for the sleeping sickness which is widespread among the natives of Africa . This disease , Fig . 30 – Eugleas its name implies , is characterized by symptoms na viridis , a ...
Стр. 68
... species obtaining their living by making themselves a nuisance to other organisms . Their victims include all sorts of animals from man to the Protozoa themselves , and there are even sporozoan parasites of sporozoan parasites . The species ...
... species obtaining their living by making themselves a nuisance to other organisms . Their victims include all sorts of animals from man to the Protozoa themselves , and there are even sporozoan parasites of sporozoan parasites . The species ...
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Часто встречающиеся слова и выражения
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