To simplify, let's examine plants and animals. Plants acquire energy via photosynthesis, whereas animals acquire energy via the breakdown of glucose from ingested materials. Ultimately, a cell must be able to create fundamental energy carrying molecules which the rest of the cell can utilize, such as the molecule ATP.
In the case of plants, photosynthesis makes use of absorbed photons, water and CO2 gas as vital components in harnessing energy and putting it into energy carrying molecules. Light-dependent reactions makes use of chlorophyll and it's ability to lose electrons when stimulated by a ...
The expert determines what energy systems are responsible for living organisms to acquire energy and transform energy into other forms.