How are populations, ecosystems, and communities related?
a. A community consists of an ecosystem and its physical environment, and an ecosystem is made up of many different populations of organisms.
b. A population consists of a community of organisms and its physical environment, and a community is made up of many different ecosystems.
c. An ecosystem consists of a community of organisms and its physical environment, and a community is made up of many different populations of organisms.
d. An ecosystem consists of a population of organisms and its physical environment, and a community.