Tropical rainforests have more kinds of plants and animals than any other land biome. which of the following is a biotic factor in a tropical rainforest? a. a stream running through the forest b. the region's air quality c. a population of decomposers d. the average amount of rainfall

c) a population of decomposers

Explanation: An ecosystem's biotic factors include all of the living organisms in the ecosystem, including microscopic decomposers such as bacteria and protists.

An ecosystem's abiotic factors include all of the nonliving components in the environment, including temperature, air, water, and rocks.

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the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.