Life Begins at Gastrulation

Gastrulation, according to the Kenyon College, is cell movement that results in a massive reorganization of the embryo from a ball of cells into a multi-layer organism. During gastrulation, groups of cells are formed for each system that the matured organism will have. There is a group for the nervous system, skeletal system, organ system, muscle system, circulatory system, and integumentary system. This process occurs for every living species--wether human or animal. Movements are allowed on massive scales during this process. This allows cells to establish great complexity from their very simple starting form (Cold Spring Harbor). Some people believes this marks the begging of life due to this is when the embryo becomes an organism, which is considered living.