[Solved] ___________ occurs when a fertilized egg enters cell division without further growth in volume. A)Cleavage B)Gastrulation C)Differentiation D)Embryology Psychic Energy: A concept in psychoanalytic theory referring to the force behind human drives, desires, and mental processes. Carnal Desires: Powerful feelings or appetites of a sexual nature. Sexual Activity: Any behavior that involves sexually arousement or stimulation, including intercourse and other erotic behaviors. Developmental Stages: Developmental stages refer to the distinct periods in an individual's life during which predictable patterns of growth and behavior are observed, such as infancy, childhood, adolescence, and adulthood.