Literally free points and a picture because i dont know

How do earth’s systems interact with each other?

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.

B. speculate about one positive way and one negative way that this boundary has affected the geographical units it separates over time.