Answer: D.) They study the stars and gases around black holes.
Explanation: Given the technology that we have in the 21st century (as of 2020), scientists cannot study black holes directly, and must resort to observing and detecting how the presence of them exists by noting how they take an effect on the matter surrounding them.
Answer: Takes small behaviors and combines them to form a new target behavior
Explanation:
Answer:
The massive dust storms caused farmers to lose their livelihoods and their homes. Deflation from the Depression aggravated the plight of Dust Bowl farmers. Prices for the crops they could grow fell below subsistence levels.
Explanation:
basically it's A lol
10. The Steam Engine, The Water Wheel, The Coal Burning Engine.
11. Machines became capable of doing most of the manual labor.
12. Polution levels rose and disease became easier to spread. There was also alot of smog in the air from the factories that popped up around that time.
13. a policy or attitude of letting things take their own course, without interfering.
14. Im not all that sure
15. (the question says to pick a change, not to discuss it in detail. only to pick one to discuss in detail) The Roaring Twenties.
