Answer:
The ability to walk and talk is the result of Child Development
Step-by-step explanation:
Child development consists of an ordered sequence of progressive transformations resulting in an increase in the degree of complexity of the organism, distinguished from growth by referring to changes in the composition and functioning of cells (cell differentiation), the maturation of systems and organs and the acquisition of new functions.
It varies from the succession of phases in an isolated organic system, for example the development the immune system, to the development of the the organism as a whole, such as the ability to move, which depends so much on the maturation of the nervous system.