What percentage of the biosphere?

I'm not sure what the question actually is. Do you mean the surface of the land? And habitable by humans I guess. If so, there is already an answer: What percentage of earth's surface is habitable? read more

All seawater contains life, so the marine biosphere includes every drop of water. Starting with that 71% of the SURFACE AREA, we need to consider the depth, or height to grasp the volume. At the deepest point, the oceans are almost 7 miles deep. read more

The biosphere, though primarily H 2 O in composition, contains very little of the total water at the terrestrial surface, only about 0.00004 percent, yet the biosphere plays a major role in the transport of water vapour back into the atmosphere by the process of transpiration. read more

Biosphere, relatively thin life-supporting stratum of Earth’s surface, extending from a few kilometres into the atmosphere to the deep-sea vents of the ocean. The biosphere is a global ecosystem composed of living organisms (biota) and the abiotic (nonliving) factors from which they derive energy and nutrients. read more