Evolution Of Life Question 48
Question: The atmosphere of early earth probably contained no $ O_2 $ until the emergence of organisms that:
Options:
A) Were chemoautotrophic.
B) Were oxygen-respiring.
C) Used hydrogen sulfide as a hydrogen source for photosynthesis.
D) Used water as a hydrogen source for photosynthesis.
Show Answer
Answer:
Correct Answer: D
Solution:
[d] Around 2.5 billion years ago, during the Precambrian, oxygen began to accumulate in the atmosphere due to the action of photosynthetic cyanobacteria.
BETA
