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| Baer, Karl Ernst von, 1792-1876 (1) |
| Darwin, Charles, 1809-1882 (1) |
| Darwin, Charles, 1809-1882. On the origin of species (1) |
| Embryology (1) |
| Evolution (1) |
| Literature (1) |
| Natural selection (1) |
| Origin of species (1) |
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| recapitulation theory (1) |