EXPLANATION:The breaking of the C-C bonds of complex compounds through oxidation within the cells, leading to the release of a CONSIDERABLE amount of energy is called respiration. The compounds that are oxidized during this PROCESS are known as respiratory substrates. Usually, carbohydrates are oxidized to release energy, but proteins, fats, and even organic acids can be used as respiratory substances in some plants, under certain conditions.Along with the energy carbon dioxide and metabolic water is also released as a by-product in respiration.For example The complete combustion or oxidation of 1 mol. glucose produces 6CO2 and 6H2O (metabolic water) as end products Thus, the correct option is ''Tissue respiration''Digestion: The process of conversion of complex food substances to simple absorbable forms is called digestion and is carried out by our digestive system by mechanical and biochemical methodsExcretion is the process of removal of NITROGENOUS waste MATERIAL from the body. Excretion is performed by a specialized group of cells or organs called excretory organs.Muscle is a specialized tissue of mesodermal origin. They have special properties like excitability, contractility, extensibility, and elasticity