I believe it was approx 20,000 African Americans.
Answer: create oxygen as a by-product
The answer is B because the text mentioned the author
I don't think that your past should be affected by your future. This is because your past start by pointing out that your ability to envision the future is influenced by your memory from the past. This is because, you tend to use memories of past experiences to predict what your life will be like in the future. It is easier to use your memories when the future you are predicting is very close in time.
