Leanor Gibson and Richard Walk used a visual cliff with a glass-covered drop-off to examine behavior in crawling infants. Even when coaxed by their mothers to crawl out onto the glass covering, most infants refused to do so, indicating that they had developed which of the following

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Why were so many distinctive cultures able to develop over time in asia?

According to the federal regulations, which of the following studies meets the definition of research with human subjects? a. a researcher uses the customs office’s passenger lists for ships bringing immigrants to the us between 1820-1845 to track the numbers of immigrants from certain ethnic groups.b. a researcher conducts a linguistic study of comments posted on a local public blog.c. a developmental psychologist videotapes interactions between groups of toddlers and their care givers to determine which intervention methods most effectively manage aggression.d. a researcher asks the director of a local free clinic about the number of patients in the last two years with newly diagnosed hiv/aids.