14. The awareness that things continue to exist even when we cannot see them. ___________________________ _______________________ 15. Agents, such as chemicals and viruses that can reach the embryo or fetus during prenatal development and cause harm. _________________________ 16. The time of natural cessation of menstruation. It also refers to the biological changes a woman experiences as her ability to reproduce declines. ________________________ 17. A study in which people of different ages are compared with one another. _____________________________ ____________________ 18. The branch of psychology that studies physical, cognitive, and social changes throughout the life span. ______________________ ____________________ 19. In Piaget’s theory, the stage of cognitive development (from about 6 to 11 years of age) during which children gain the mental operations that enable them to think logically about concrete events. _____________________ ___________________ ___________________ 20. The developing human organism from 9 weeks after conception to birth. ________________
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