Metabolism encompasses all of the chemical processes that occur in our bodies. Catabolism and anabolism are the two types of metabolism. Catabolism happens when chemically complex substances are broken down into simpler chemical compounds. When breaking down sugar and lipids for energy during cellular respiration, this is an illustration of this process. Anabolism, on the other hand, refers to the formation of complex chemical compounds from simpler ones. The formation of our bones and muscles by cells known as osteoclasts is an example of this process. The ability to recognize and respond to changes or stimuli is referred to as responsiveness. As an example of responsiveness, when a person's body temperature rises, the glands produce sweat as a response. Furthermore, movement is a basic living process that relates to the mobility, coordination, and contraction of the body. An example could be the contraction of the heart, lungs, and skeletal muscles. Growth is the fourth life process that refers to an increase in body size, cell number, or cell size. The liver is an example of growth since it constantly produces new cells to replenish aging ones. Lastly, differentiation, which is the process through which a cell progresses from an unspecialized to a specialized state. Differentiation can be seen in the creation of tracheary elements such as xylem tracheids and xylem vessels.