Evolution 5.0 / 5 based on 1 ratingTeacher recommended ? BiologyEvolution, extinction and natural selectionGCSEEdexcel Created by: Lauren HutcheonCreated on: 03-04-13 20:18 8321096145 Across 1. A gradual change over time. (9) 2. A group of organisms that can interbreed to produce offspring that are fertile. (7) 4. Measure of the total number of species in an area. (12) 5. Differences in characteristics. (9) 9. A way in which to identify different species. (3) Down 2. Individuals become new species. (10) 3. Where some individuals are better adapted to an environment than others (7, 9) 6. Neither one species nor the other but show characteristics of both parents. (7) 8. How scientists name a species. (9, 6) 10. Population at each end of the chain can not interbreed. (4, 7)
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