Which of the following is a major cause of the dramatic rise in fraternal twinning and other multiple births in industrialized nations over the past several decades?

What does the crying pattern look like in infants that are carried throughout the day?

What will be an ideal response?

Which of the following would be an indicator that a child has acquired the semiotic function?

a. Sasha takes a bowl and wooden spoon and begins to pretend to be stirring cake batter. b. William is able to jump on one foot. c. Jacob can recall that his mother picks him up from day care after nap time. d. Meghan understands abstract concepts such as wait and share.