Question

what is the ultimate source of most energy in the biosphere? multiple choice geothermal energy from the core of the earth heat given off by metabolism chemicals in the soil covalent bonds in plants solar energy from the sun

Explanation:

Plants use solar energy from the sun for photosynthesis, forming the base of the energy - flow in the biosphere. Other energy sources listed are secondary or derived in some way. Geothermal energy is mainly used in specific geological areas and not the main energy source for the biosphere. Heat from metabolism is a result of energy use, not the ultimate source. Chemicals in the soil are used for nutrition, not energy source directly. Covalent bonds in plants store energy originally from the sun.

Answer:

E. solar energy from the sun