Which presentation option is also known as a screen of a presentation?

Firms use marginal analysis to determine prices by a) changing prices in accordance with information from retailers. b) using comparisons with strong competitors to position prices accordingly. c) examining the effect on revenue of small changes to the price of one item. d) trying to minimize production costs by using better and more efficient methods.

With the use/abuse of alcohol, the heart is more efficient in the use of nutrients by the heart tissue.

Pkease ! what are a few reasons why the south seceded from the union