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.
Answer:Wolbachia can only be transmitted from parent to offspring inside the female's egg. When a male mosquito that carries Wolbachia mates with a female without the bacteria then that female's eggs don't hatch. Wolbachia-infected female mosquitoes, however, produce normal numbers of offspring – which carry Wolbachia.
Explanation:
An example of a 3rd class lever is a pair of tweezers!
The use of alcohol by the operator can have an effect in operational safety of the vessel and that would include the crew as well as the passengers. Hope this is the right answer and would be of big help.
