The biosphere is all the living things on Earth. It is the global sum of all ecosystems. Living things interact with the other spheres. Plants and animals depend on the physical environment for the basics of life. They also help to mantain an alter their phusical environment.
The biosphere is the “zone of life,” consisting of all of Earth's living things
and their environments. It is not really a separate sphere from the
others but includes parts of all three. Life obviously occupies the
oceans and the surfaces of the continents, but it also exists in the
atmosphere.
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