[Solved] As part of the scientific method, a scientist proposes and tests _____. A)laws B)theories C)hypotheses D)principles E)facts 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. Libido: A term primarily used in psychoanalytic theory to denote the energy of the sexual drive as a component of the life instinct. Unconscious: Relates to the part of the mind that is inaccessible to the conscious mind but that affects behavior and emotions.