What causes new species to evolve?

Related questions

1. Why is evolution interesting?
2. When did humans leave Africa?
3. Where is the evidence for evolution?
4. What is population equilibrium?
5. Is Evolution a Fact?
6. When did humans appear on Earth?
7. How did the theory of evolution changed the world?
8. Why are fossils important in the study of evolution?
9. Who is the oldest person in the world?
10. Why is evolution important to medicine?

Tags

1. #isolated
2. #gradual
3. #change
4. #become
5. #continents
6. #evolve
7. #apart
8. #environmental
9. #cause
10. #split
11. #forces
12. #causing
13. #environment
14. #isolation
15. #deserts
16. #eventually
17. #species
18. #adapt
19. #result
20. #organism
21. #organisms
22. #mountains