The breech position is a type of

Coating the neural fibers with an insulating fatty sheath during the process of _________________ improves the efficiency of message transfer.

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

In the phenomenon of ___, infants respond to emotional cues from parents and other adults, particularly in situations that are ambiguous or unfamiliar, in order to gather information about how to behave and feel in those situations

a. the still face b. social referencing c. self-evaluation d. mutual responsiveness