The light of dawn and the buzz of an alarm clock lead to wakefulness through the

Reticular activating system is the correct answer.

The reticular activating system is a very complex network of neurons located in the brainstem that is responsible for regulating arousal, alertness and sleep-wake transitions. This system is very important to the human body, if damaged it can result in coma, lethargy or sleep problems.

the answer is either c or d i think its d

by using  production possibilities graph.  opportunity costs are key expenses in financial matters and are utilized as a part of registering money saving advantage investigation of a venture. such expenses, be that as it may, are not recorded in the record books but rather are perceived in basic leadership by processing the money costs and their subsequent benefit or misfortune.