Sleep spindles typically occur during which stage of sleep?

In the classic BoBo doll experiment, those children that saw aggressive models were more likely to behave ______ towards the bobo doll

Fill in the blank(s) with the appropriate word(s).

Which of the following is an example of physical development?

A) communication and language B) attachment to the primary caretaker C) growth of the brain and nervous system D) improvements in long-term memory