4. Scientists are studying photosynthesis in a forest ecosystem that has plants, animals, and
decomposers (which consume dead things). Which group or groups of organisms in the forest
carry out photosynthesis?

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.