plzzz help esay points, i tried everything dose any one know where i can get the answer key for ap. ex sociology.

How do astronomers measure the amount of dark matter in the universe

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

Based on the graph, how is coal consumption likely to affect future generations? a. the higher our current rate of consumption, the less coal will be available in the future. b. current rates of consumption are irrelevant because new coal will form in the future. c. the lower our current rate of consumption, the more slowly coal will be replenished for the future. d. regardless of current rates of consumption, coal will always be available.