Answer:
Object permanence.
Explanation:
Object permanence is a knowledge that objects are still in existence even when they are no longer within reach, cannot be seen or even heard. It is developed through touching of such items. At 5 months Fredrick has not developed to be able to recognize this fact, but at 9 months moving around to search for a ball shows that he now recognizes that despite the fact that the ball is not in sight it is still lying around somewhere and he wants to get a hold of it.
B.
The Probability of choosing a girl is 17/30.
The probability of choosing an A student is 5/30
<span>The P(girl) + the P(A student) = 17/30 + 5/30 = 22/30 = 11/15.</span>
A true statement of a mass movement is that not all mass movements are fast.
