Changes in biology, physical, psychological & behavioral processes as we age. Inverted u- shape (looks like a hill) o. Emerges early peaks diminishes with age. Diferent cohorts grew up in diferent ime periods: diferent experiences, cultural changes, environment changes. Cohorts - group born at the same ime. Pros and cons of both the longitudinal and cross-secional. Zygote ataches to uterine wall: embryonic stage. Placenta & umbilical cord develop: fetal stage. Environmental agents that ,ay occur abnormal fetal development: maternal malnutriion. Miscarriages, premature birth, sill broth, impaired brain development: maternal stress ( stress hormones) Hear, smell, taste, touch and see ( somewhat) How do we know when a newborn knows something? o o o. Its common, the baby learned to recognize the patern shown to them. They look to see if the baby has a preference for the more colorful or plan scene. The change a baby has in the environment.