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.