The biosphere is the part of the earth where life exists and covers all the ecosystems. It is every biome that has living organisms. Thus, option A is correct.
What is the biosphere?
The biosphere is the part of the earth that is composed of the living organisms present in the ecosystem ranging from the plant roots to the sea and forest to the mountains. They include the plants and animals along with the microbes that live in a habitat. All ecosystems are part of the biosphere.
Therefore, the biosphere includes living things.
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