Across
- 2. a portion of an existing population becomes totally isolated because of geographical barriers
- 3. global and catastrophic events that wipe out 25-75 percent of species
- 8. there are no physical barriers and populations of a species that inhabit the same geographic region
- 9. first fossil was found in 1891 on the island of Java in Indonesia
- 11. supports the notion that gaps in the fossil records are evidence of rapid spurts of change
- 12. refers to the movement of genes from one generation to the next
- 16. refers to a population of organisms that share similar characteristics
- 17. modern humans
- 18. more heavily built than modern humans, although they had the same brain capacity
- 20. in this phenomenon, two or more species can equally influence one another's evolutionary direction
Down
- 1. lived in Africa for about 500 000 years
- 4. refers to the loss of an entire species for various reasons
- 5. occurs when some members of a species are suddenly separated from the rest of the population
- 6. groups of initially related organisms evolve siilar structure to adapt to a similar habitat
- 7. occurs when closely related species move to a new habitat because of a new diverging lifestyle
- 10. first hominids
- 13. a population moves from its present habitat to a new one
- 14. indicate how organisms evolved and survived amidst environmental pressures
- 15. describes the development of new species
- 19. organisms evolving or changing into something different