A unique advantage of which of the following is that it will control for variables that study investigators are unable to measure

That’s easy the answer is 42

answer: Major medical insurance policies provide coverage for catastrophic or prolonged illnesses and injuries. Most of these programs have large deductibles and lifetime maximum amounts.

In the app there are different ranks based on questions you answer. Basic is a rank.

I would give every family a months worth of supplies then shut down everything in the world for a month