What is the building up and breaking down process occurring in animals?

The building up process in animals is known as anabolism, where simple molecules are combined to form more complex structures, such as proteins, nucleic acids, and carbohydrates, essential for growth and repair. Conversely, the breaking down process is called catabolism, which involves the breakdown of complex molecules into simpler ones, releasing energy that can be utilized for various cellular functions. Together, these metabolic processes maintain homeostasis and support the overall energy balance within the organism.