Earthʹs Biosphere

Multiple Choice

Earthʹs biosphere

A) consists of only terrestrial organisms,while the hydrosphere includes aquatic and marine organisms.
B) is more a theoretical construct than an observable sphere of study.
C) extends from the ocean floor to an altitude of approximately 8 km (5 mi) into the atmosphere.
D) only includes the biotic components of an ecosystem,with the abiotic components being considered part of the lithosphere,hydrosphere,or atmosphere,respectively.