Metabolic activity refers to the chemical processes that occur within an organism to maintain life. These processes involve the conversion of nutrients into energy and the building of cellular components necessary for growth and maintenance.

Metabolic activity can be divided into two types: catabolism and anabolism. Catabolism refers to the breakdown of complex molecules into simpler ones, which releases energy that can be used by the cell. Anabolism, on the other hand, refers to the building of complex molecules from simpler ones, which requires energy.

The rate of metabolic activity can be affected by a variety of factors such as temperature, pH, and the availability of nutrients. For example, a decrease in temperature can slow down metabolic activity, while an increase in temperature can speed it up. Similarly, changes in pH can also affect metabolic activity by altering the activity of enzymes involved in metabolic processes.

Metabolic activity is essential for the survival of all living organisms, from single-celled organisms to complex multicellular organisms. It plays a critical role in maintaining homeostasis and providing energy for cellular processes.