Final answer:
Differentiation is the term that describes the process of gradual change and specialization in biology.
Step-by-step explanation:
The term that describes the process of gradual change and differentiation in biology is differentiation.
Differentiation is the process by which unspecialized cells become specialized into different types of cells, such as neurons or epithelial cells. This process is essential for the development and specialization of tissues and organs in multicellular organisms.
It allows cells to acquire specific functions and forms the basis for the complexity and diversity of life.