[Solved] A naked virus only has a/n A)capsid. B)capsomere. C)nucleocapsid. D)envelope. E)antigenic surface. Recreational Drugs: Substances taken for pleasure rather than for medical reasons; often associated with altering one's mood, perception, or consciousness. Moral Development: The growth in an individual's understanding of right and wrong, based on cultural, societal, and personal values. Critical Period: A specific timeframe in the development of an organism during which it is especially sensitive to certain stimuli or experiences, which are essential for normal development. Cataracts: Clouding of the lens in the eye, leading to a decrease in vision and potentially blindness if untreated.