While playing house, 3-year-old Lindsay uses a straw as a “bottle” to feed her doll. Lindsay has begun to grasp __________

By the end of the fourth week the embryo's head is apparent and the eyes, nose, mouth, and ears begin to form. How long is the embryo at this point?

a. ¼ inch b. 4 inches c. 8 inches d. 12 inches

Behavior directed at helping others with no thought or expectation of personal gain is called ________ behavior

a. altruistic b. deindividuated c. diffused d. reciprocal