an ecosystem contains a large community of / large numbers of living organisms
multicellular_algae is multicellular_organism. population is group_of_living_organisms. large_living_organisms_tend_to has not more_mass_than_smaller_ones large_living_organisms_tend_to has more_mass_than_smaller_ones group_of_living_organisms is group_of_living_things. biome is ecosystem. multicellular_organism is living_organism. group_of_animals is group_of_living_organisms. population is not group_of_living_organisms. earth has many_different_living_organisms