Maturation is biologically based (for the most part) and explains such things as learning to sit up, crawl, and walk.

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Maturation refers to the process of development in which an individual matures or reaches full functionality. This process is largely biologically based, governing physical growth and development of the body and brain, which in turn enable milestones such as sitting up, crawling, and walking. These milestones typically occur in a predictable sequence, influenced by genetic factors, and are less affected by environmental factors, except in cases of severe deprivation or illness.

Maturation Is Biologically Based (For the Most Part) and Explains