AP BIOLOGY

Detailed explanation-1: -The biosphere is made up of the parts of Earth where life exists-all ecosystems. The biosphere extends from the deepest root systems of trees, to the dark environments of ocean trenches, to lush rain forests, high mountaintops, and transition zones like this one, where ocean and terrestrial ecosystems meet.

Detailed explanation-2: -The biosphere is a relatively thin layer of the Earth’s surface that supports life, reaching from a few kilometers into the atmosphere to deep-sea vents. The biosphere is a global ecosystem made up of living organisms (biota) and the nonliving (abiotic) factors that provide them with energy and nutrients.

Detailed explanation-3: -The bulk of living organisms actually live within a smaller fraction of the biosphere, from about 500 meters below the ocean’s surface to about 6 kilometers above sea level. Dynamic interactions occur between the biotic region (biosphere) and the abiotic regions (atmosphere, lithosphere and hydrosphere) of the earth.