Answer:
D fossil record
Explanation:
Depending on what layer of earth the fossil was recorded then they could determine a rough date. Then they would use carbon dating to be more exact.
They contain symbiotic bacteria called rhizobia.
The total magnification is calculated by MULTIPLYING the ocular lens magnification and the objective lens magnification.
I wouldn't know how to solve this question since I don't have all the information given to solve this problem. But I'm going with a hypothesis, but if given more information I would be glad to help.