The gap separating the shortest and tallest 8-year-olds worldwide is explained by ________.
A. heredity, but not environmental factors
B. environmental factors, but not heredity
C. both hereditary and environmental factors
D. neither heredity nor environmental factors
Answer: C
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When do the organizing effects of sex hormones occur in rats?
a. well before birth b. shortly before and after birth c. during their juvenile period d. at approximately two months of age
When the CS no longer elicits the CR, spontaneous recovery has taken place.
Answer the following statement true (T) or false (F)
By age 6, children's vocabulary is about ____ words
a. 100 c. 10,000 b. 1,000 d. 100,000
During the _____ stage of development, according to Piaget's cognitive-developmental theory, infants progress from responding to events with reflexes, or ready-made schemes, to goal-oriented behavior
a. sensorimotor c. concrete operational b. formal operational d. preoperational