Evolution: The Way of Man |
From inside the book
Results 1-5 of 5
Page 57
... lancelets ) this is the only longitudinal supporting axis the body ever possesses , but in the higher fishes and all other vertebrates ( amphibia , reptiles , birds and mammals ) where a more stable axis is necessary , the notochord is ...
... lancelets ) this is the only longitudinal supporting axis the body ever possesses , but in the higher fishes and all other vertebrates ( amphibia , reptiles , birds and mammals ) where a more stable axis is necessary , the notochord is ...
Page 196
... lancelet , or amphioxus , the notochord persists throughout life , and is the only internal skeleton possessed by it . In the lampreys , a group of larger eel - like animals , the notochord also persists through life , but these ...
... lancelet , or amphioxus , the notochord persists throughout life , and is the only internal skeleton possessed by it . In the lampreys , a group of larger eel - like animals , the notochord also persists through life , but these ...
Page 197
... lancelets , of which only about ten living , rather widely scattered , species are known , are only from half an inch ... lancelet is certainly a fish ; but in degree of development it differs more from the lowest true fish than such a ...
... lancelets , of which only about ten living , rather widely scattered , species are known , are only from half an inch ... lancelet is certainly a fish ; but in degree of development it differs more from the lowest true fish than such a ...
Page 198
... Lancelets may be regarded as vertebrates expressed in the lowest terms . Let us begin now with the true vertebrates . They are characterized by the possession of a bony in- ternal skeleton composed of a longitudinal axis , the backbone ...
... Lancelets may be regarded as vertebrates expressed in the lowest terms . Let us begin now with the true vertebrates . They are characterized by the possession of a bony in- ternal skeleton composed of a longitudinal axis , the backbone ...
Page 289
... Lancelet , 197 Leeches , 187 Life , origin of , 109 Linnæus , 16 Liverworts , 155 Lizards , 202 Lyell , 66 Mammals , 207 Man , brain of , 248 embryology of , 55 evolution of , 217 influence on Nature , 272 prehistoric , 227 Mayor ...
... Lancelet , 197 Leeches , 187 Life , origin of , 109 Linnæus , 16 Liverworts , 155 Lizards , 202 Lyell , 66 Mammals , 207 Man , brain of , 248 embryology of , 55 evolution of , 217 influence on Nature , 272 prehistoric , 227 Mayor ...
Other editions - View all
Common terms and phrases
adaptation adult algæ American amphibians animal kinds animals and plants anthropoid apes aquatic artificial selection behavior biological evolution biologists birds blood body bones brain branches brate called cavity chapter character cocoons colonial color Cro-Magnon Darwin distribution earth echinoderms egg cells embryo environment evidence evolution idea evolutionary existence explanation of evolution fact factors ferns fishes flowering plants fossils fundamental geologic golden gradatory heredity higher human evolution human future individuals insects islands Lamarck lancelet land larvæ living creatures lowest lution make-up mammals man's mind modified mollusks Monterey pine natural selection naturalists notochord ocean offspring one-celled organs paleontology parents pine plants and animals polyps prehistoric present produced Protozoa races reptiles rocks sea anemones sea urchins segments shell similar skeleton social inheritance societal evolution species sponges stages starfish structure swimming tion to-day trait trees types variations variety various vertebrates wings young