If i made one b in a class, but my average in that class is still an a, will my gpa be lowered (even the slightest) because of that b?

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.

Explain the popular saying "we are made of stardust. how are we made of stardust? use scientific vocab.

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