Across 2. structures that are similar in different species 5. a characteristic that helps an organism survive 9. when one species evolves into many; adaptive ____ 10. pattern of evolution where a species is stable for a long time then rapidly changes; _____ equilibrium 12. the name of Darwin's book; the ___ of species 13. process by which evolution occurs; natural ______ 17. had different shaped shells depending on the island they were from 18. well-supported testable explanation 20. when two species evolve together 21. natural selection is also known as the survival of the ______ 22. islands that Darwin visited 23. principle that states that living species are descended from ancient ones; descent with ______ 24. the name of the ship that darwin traveled on |
Down 1. when two unrelated organisms look alike (sharks & dolphins) |