Which best describes Earth's biosphere?
A)It consists of only terrestrial organisms,while the hydrosphere includes aquatic and marine organisms.
B)It only includes the biotic components of an ecosystem,with the abiotic components being considered part of the lithosphere,hydrosphere,or atmosphere,respectively.
C)It is more a theoretical construct than an observable sphere of study.
D)It extends from the ocean floor to an altitude of approximately 8 km into the atmosphere.

Question

Quizplus · Accepted Answer

The biosphere includes all living organisms on Earth and extends from the ocean floor to an altitude of approximately 8 km into the atmosphere, per Option D. Option A is incorrect because the biosphere includes both terrestrial and aquatic organisms. Option B is incorrect because the biosphere includes both biotic and abiotic components. Option C is incorrect because the biosphere is an observable sphere of study.

Which Best Describes Earth's Biosphere