Lesson 2: DEVELOPMENT STUDY
Life begins at conception when a new organism is created with the mother’s ovum fertilized by the father’s sperm. From that point till death an individual keeps on growing and changing. Such changes are not random but orderly and they generally follow a pattern. Development is the process by which organisms grow and change systematically over the entire life period i.e., from conception till death. Developmental changes are not only growth or additions to human organisms, they also involve decay.