16. What roles does water have on the earthâ€™s climates and biomes?
17. What are impacts of desertification, deforestation, and pollution in the air?
18. Examine the field of conservation biology and strategies to minimize human impact on the biosphere.
19. Discuss keystone species, exotic species, and their relationship to community stability.
20. Describe research on Trinidad guppies, and the relevance of this research to evolution.