Species richness describes the abundance of species in a community. the number of different species in a community. the number of species in a population. the landscape of a region. all the biotic and abiotic factors in an ecosystem.

4emphysema is a health condition in which the lungs can no longer expel carbon dioxide normally. as a result, a person who has emphysema may have high blood acidity levels. the body process that would attempt to return the blood ph to normal so that cells could function properly is called a. active transport b. acidosis c. homeostasis d. adaptation