consists of energy-releasing decomposition reactions. Such reactions break covalent bonds, produce smaller molecules from larger ones, and release energy that can be used for other physiological work. Energy releasing reactions are called exergonic reaction.

The correct answer is: Catabolism.

Explanation:

Catabolism can be defined as the metabolic process by which larger polymeric bio-molecules are broken down to smaller monomeric bio-molecules.This process causes the breakage of the chemical bonds which link the monomeric units in the polymeric bio-molecule.Large amounts of energy remain stored in these chemical bonds.When these bonds break they release a huge amount of energy.This released energy is then stored in the cells in the phospho-anhydride  bonds of the ATP or Adenosine Triphosphate molecules.The monomers formed are either further broken down into simpler compounds to release more energy or are used for the synthesis of new polymers by the process of Anabolism.In the catabolic process, polysaccharides are broken down in monosaccharides, polypeptides are broken down into amino acids and lipid molecules are broken down in fatty acids.

We can use solar powered cars or ride bikes instead of cars that burn fossil fuels