Question

Energy constantly flows into the biosphere as sunlight. this energy flows through organisms and the environment and eventually flows out of the biosphere as

Answer 1

Heat is then the by-product of the light energy from the Sun flowing through the biosphere. Organisms are inevitably dependent on sunlight to perform essential biological processes in order to sustain life. In the absence of this energy, all the organisms on Earth would die. 

Answer 2

Heat(is correct on grad point)