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X. On the Imperfection of the Geological Record. On the Sudden Appearance of Whole Groups of Allied Species. Darwin, ... (1003 words) |
 | If numerous species, belonging to the same genera or families, have really started into life at once, the fact would be fatal to the theory of evolution through natural selection. |
| For the development by this means of a group of forms, all of which are descended from some one progenitor, must have been an extremely slow process; and the progenitors must have lived long before their modified descendants. |
| The case most frequently insisted on by palæontologists of the apparently sudden appearance of a whole group of species, is that of the teleostean fishes, low down, according to Agassiz, in the Chalk period. |
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Transmutation - Wikipedia, the free encyclopedia (382 words) |
| Transmutation is the conversion of one object into another. |
| Transmutation of transuranium elements such as the isotopes of plutonium, neptunium, americium, and curium has the potential to contribute to solving the problems posed by the management of radioactive waste, by reducing the proportion of long-lived isotopes it contains. |
| Transmutation of chemical elements occurs through nuclear reactions. |
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