When depression alternates with periods of mania, meaning the person is agitated, elated, and hyperactive, one would suspect that which type of disorder is involved?

Compared to true experiments, quasi-experiments

a. generally do not control extraneous variables as well b. are less useful for answering many real-world questions c. lack realism d. can not be analyzed using sophisticated statistics e. all of the above

The highly addictive depressants of opium, morphine codeine, and heroin are classified as __________

Fill in the blank(s) with correct word