Exam 2 Crossword

2. creates habitat for other species
4. energy available for higher trophic levels
7. two species exploit a habitat differently so they do not encounter each other
8. one species improves habitat conditions allowing other species to colonize the habitat but itself does not benefit from these species
13. result when two species cannot avoid competing with each other
16. begins after gene flow is disrupted between populations
18. can be explained by adaptive radiation or mass extinction or lack of time resolution in fossil record
19. form of parasite that consumes or kills its host as it emerges (like in 'Alien')
20. rates of this vary with temperature and moisture and oxygen availability

1. selection favors phenotypes which can avoid competition allowing multiple species to coexist
3. range of biotic and abiotic conditions that can be occupied by a species
5. species which are all dangerous but gain shared protection by resembling each other
6. two populations which are reproductively isolated from one another
9. hybrids are sterile which reinforces speciation
10. can prevent competitive exclusion allowing species to coexist
11. necessary process performed by biodiversity which would be prohibitively expensive if humans had to perform it through technology
12. can cause species to be exposed to changing environmental conditions over time as a result of plate tectonics
14. isolating mechanism that prevents hybrids from forming
15. top-down trophic interaction which can increase community diversity by changing resource availability
17. cold nutrient-rich water being brought to the surface by strong offshore winds or the Coriolis effect