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Which of these best defines the term "biosphere"?

A the part of Earth where life occurs, which includes land, water, and air
Explaination
The definition of biosphere encompasses all places life occurs on Earth, including land, water, and air. A collection of populations in a habitat is called a community.
B a collection of populations in a habitat
C the part of Earth where life occurs on land
D the part of Earth where life occurs on land and in the water