The Science History of the Universe volume 6
The Science History of the Universe volume 6
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In our eReader you can find the full English version of the book. Read The Science History of the Universe volume 6 Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book The Science History of the Universe volume 6
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The older arrangements, according to habits and external characters, do not altogether agree with the natural rela- tionships of different groups. It is nevertheless very con- venient, and the division into perchers, waders, birds of prey, marine birds, ostriches, etc. , altho known to be unnatural, is largely used in default of general agreement as to the natural relationships of the different groups.
It may be assumed that birds are derived from some early type of primitive reptile, nearly re...lated to the Dino- saurs, in the early part of the Age of Reptiles. This hypo- thetical ancestor of the bird would be distinguished from the small upland Dinosaurs mainly by the fact that its scales had evolved into feathers, thereby enabling it to maintain a higher body-temperature and more active life. Its habits would be much like those of the Ostriches, but the tail long, vertebrated, lizard-like, with feathers on each side, and the jaws provided with teeth instead of a horny beak. The transformation of the fore-limbs into wings might result either from their being used as an aid to running on the ground or in making soaring leaps from tree to tree.
What to read after The Science History of the Universe volume 6?
You can find similar books in the "Read Also" column, or choose other free books by Francis William Rolt Wheeler to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The older arrangements, according to habits and external characters, do not altogether agree with the natural rela- tionships of different groups. It is nevertheless very con- venient, and the division into perchers, waders, birds of prey, marine birds, ostriches, etc. , altho known to be unnatural, is largely used in default of general agreement as to the natural relationships of the different groups.
It may be assumed that birds are derived from some early type of primitive reptile, nearly re...lated to the Dino- saurs, in the early part of the Age of Reptiles. This hypo- thetical ancestor of the bird would be distinguished from the small upland Dinosaurs mainly by the fact that its scales had evolved into feathers, thereby enabling it to maintain a higher body-temperature and more active life. Its habits would be much like those of the Ostriches, but the tail long, vertebrated, lizard-like, with feathers on each side, and the jaws provided with teeth instead of a horny beak. The transformation of the fore-limbs into wings might result either from their being used as an aid to running on the ground or in making soaring leaps from tree to tree.
What to read after The Science History of the Universe volume 6?
You can find similar books in the "Read Also" column, or choose other free books by Francis William Rolt Wheeler to read onlineMoreLess
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