________ utilized direct laboratory observations to understand human sexual responses

Which of the following is a true statement about environmental pollutants?

a. there is no evidence that environmental pollutants can impair prenatal development b. only pollutants that are ingested, such as mercury, can impair prenatal development c. only pollutants that pass through the respiratory system, such as automobile emissions, can impair prenatal development d. pollutants that are ingested and those that pass through the respiratory system can both impair prenatal development

Sexually active adolescents have what rate of sexually transmitted infections compared to other age groups?

a. similar b. lower c. higher d. The rate is lower, but the types of STIs they contract are more severe.