Answer: 1950s
Explanation: Data gathered by ocean graphic surveys conducted by many Nations legend discovery that a great mountain range and on the ocean floor virtually into good Earth. From noaa.gov
It’s d!!!!
Ik this since I did this quiz
The answer here is D, and it's kind of obvious. But you probably already knew the answer and are just doing this for piece of mind.
Explanation: Just the fact that we don't know whether or not there even is extraterrestrial life rules out every other answer, without even needing to go in depth.
(Okay, I read your question completely wrong, it's asking for which one of these has been solved isn't it?)
This is tough because all of these other than D have been figured out. Go with the methane atmosphere then.
As , when the earthworms crawl inside the soil , it gets holes by which air can enter the soil and the growth of plant is fast.
