Having no light. If it is dark, you need light to be able to see.
B.
Civilization on the Italian peninsula began growing as early as the eighth century BCE, and the Roman Empire reached its territorial peak under Emperor Trajan, who died in CE 117
Answer:
Family and Community Services and Early Childhood Development
I believe it would be A. The importance of staying active
Explanation:
Developed by B.F Skinner, operant conditioning is a way of learning by means of rewards and punishments. This type of conditioning holds that a certain behavior and a consequence, either a reward or punishment, have a connection which brings about learning.