Which of the following can be used to diagnose infections by detecting specific antibodies in a patient's serum?

In games, rules:

A. need to be loosely adhered to in order to predict an outcome. B. outline the wrong choices that could be made in a game. C. define the actions that are allowed in a game. D. define the winners of a game.

If a shortage exists in a market, the natural tendency is for:

A. price to increase. B. quantity supplied to decrease. C. demand to increase. D. no change in the market.