For a living thing to function properly, its internal environment must maintain , or be kept relatively constant. this applies to individual cells as well as entire organisms.

homeostasis

Explanation:

Living beings maintain the constant environment of the body. It is called homeostasis. Homeostasis is the maintenance of a relatively stable internal environment of the body. It is the result of all of the body’s regulatory processes.

For example, the blood glucose level is normally maintained between 70 and 110 milligrams of glucose per 100 ml of the blood. A rise of blood glucose level is counteracted by increased secretion of the hormone insulin from the pancreatic cells. Therefore, cells and higher levels such as organs and organ systems, contribute to maintaining homeostasis.

metamorphism is the change of minerals or geologic texture (distinct arrangement of minerals) in pre-existing rocks (protoliths), without the protolith melting into liquid magma (a solid-state change). the change occurs primarily due to heat, pressure, and the introduction of chemically active fluids. i hoped i !

that is wrong, its not thymus.