Bioenergetics is the study of flow of energy into biosphere, absorption by producers and transformation in living beings. Fusion of about 4 million tonnes of hydrogen/sec in sun is the source of energy on this planet. Only .47% solar radiations reach the surface of earth (53% are reflected or absorbed by clouds, dust particles etc.)
This energy controls atmospheric temperature, soil temperature, seasons (angle of radiations), climatic zones, air currents, formation of water vapours, etc. Energy is ultimately dissipated.
They are exchanges/circulation of biogenetic nutrients between living and non-living components of biosphere.
They are essential elements required by organisms for their body building and metabolism which are provided by earth and return to the earth after their death and decay.