3. How are populations, ecosystems, and communities related? (1 point)
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 population is made up of many
different communities of organisms.