Professor lopez believes that severe depression results primarily from an imbalanced diet and abnormal brain chemistry. professor lopez favors a perspective on depression.

Explanation:

Bio perspective because he's involving imbalance diet with depression.

Neurological perspective because he's involving brain chemistry, which is studied in neuroscience.

So, he's approach is with both, a dual perspective.

the first question's answer is a.

i believe that the answer to the question provided above is that the role of campaign committees is to act as a bridge between state and local campaigns.