Photosynthetic prokaryotes caused aerobic atmosphere during the history of Earth.
I think it is D hope this helps
The correct answer among all the other choice is D. U.S. naval blockade of Cuba. This event resulted in the greatest threat of nuclear war. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
Maybe the industrial revolution? think about the plentiful businesses starting in the west like in socal. there was also lots of farming opportunities there
The red scare was used to describe the period where the fear of communism was rampant in the US... later macarthyism
