The placenta screens out all harmful substances to prevent them from reaching the baby

In order to capture diversity in a population, researchers may use __________ to ensure

representative subgroups (e.g., African American; Latino; etc.) within a study population. A) simple random sampling B) target populations C) area populations D) stratified random sampling

Freud's psychosexual theory

A) was the first to stress the influence of the early parent–child relationship on development. B) was eventually criticized because it underemphasized the influence of sexual feelings in development. C) applied in all cultures. D) ignored personality development.