Author Question: If we went back in time 10 billion years, how would we expect a plot of galaxy luminosities against ... (Read 55 times)

K@ · **on:** Jul 27, 2018

If we went back in time 10 billion years, how would we expect a plot of galaxy luminosities against colors to change?

A) The red cloud would be much more sparse.
B) The blue cloud would be much more heavily populated.
C) The blue cloud would be much less populated.
D) Both A and B

Question 2

According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on Earth?

A) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth.
B) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life.
C) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life.
D) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life.