Some teratogens are harmless until they reach a certain level of exposure; they then become dangerous, thus demonstrating the

Critics of Gardner's theory point out that

A) the unusual skills of people with savant syndrome are mechanical and inflexible because those skills are not aided by other abilities. B) Gardner ignores the role of cultural and educational experiences in intellectual development. C) the theory is at odds with the existence of prodigies who show precocious development in only one area. D) his intelligences are only weakly correlated with a single overarching mental ability.

Attempts to categorize types of grandparents have not been very successful because a. grandparents use different styles with different grandchildren

b. measuring these styles has not been found to be valid. c. styles of grandparenting do not seem related to the quality of the relationship. d. grandparenting behavior differs during each interaction with the grandchild.