At the moment of conception, a male's sperm cell fertilizes a female's egg to form the single-cell
a. fetus.
b. embryo.
c. neonate.
d. zygote.
Answer: d. zygote.
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Primary sex characteristics are those
a. structures that do not involve reproductive structures. b. such as breast development and deepening of the voice. c. that begin to develop during primary or elementary school. d. structures that make reproduction possible.
In an experimental study of the effects of exercise on stress, exercise is the a. dependent variable
b. independent variable. c. control group. d. experimental group
Levinson maintained that the alternating sequence of developmental "seasons" in which there are structure building-maintaining periods and transitional periods holds for
a. men b. women c. both men and women d. neither men nor women e. none of these
According to Piaget, which is not a characteristic of the preoperational stage?
a. ability to practice conservation b. egocentrism c. confusion between mental and physical events d. ability to focus on only one dimension at a time