CELLULAR (INTERNAL/TISSUE) RESPIRATION
The oxidation of glucose in the cell to release energy is known as cellular respiration and it occurs in the mitochondria of all living cells. There are two types of cellular respiration i.e. aerobic and anaerobic respiration

Environment/Nature and State of Matter
Living cells are known to be surrounded by a watery environment. This may include:
Fresh/salt water in which the unicellular organisms live, Intercellular fluid that bath the bodies of cells of higher animals

The cell is the simplest, smallest, basic, structural and functional unit of life. The cell can carry out all life activities such as growth, respiration e. t. c.
Cells can exist in various forms which include