Which of the following statements best describes most S&M encounters?

a. They involve mostly impulsive behaviors and no one receives lasting harm.
b. They involve mostly impulsive behaviors in which someone is typically injured.
c. They involve planned out behaviors and no one receives lasting harm

Ty is a researcher who wants to determine the typical amount of time it takes for Peruvian adolescents to develop from the onset of puberty to full maturation. Among the following choices, which type of study should Ty conduct?

a. Cross-sectional study. b. Ethnographic study. c. Secular study. d. Longitudinal study.

Arnold Gessell

A) was among the first to make knowledge about child development meaningful to parents by writing child-rearing books. B) is generally regarded as the founder of the child study movement. C) concluded that the development of the human child follows the same general plan as the evolution of the human species. D) constructed the first successful intelligence test.