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.
The reasons are many. The most major reason was the fact that they were outnumbered by the U.S.
Answer: A. before history was written.
Explanation:
I'm not sure if you need an explanation, but prehistoric means "very old or out of date." Hope this helps, Good luck! :)
Answer:
1. Water vapor condenses to form clouds.
2. Water falls as rain, snow, and sleet.
3. Water flows down mountains and hills.
4. Water joins streams or forms groundwater.
Answer:
<h3>Maintenance of ionic balance.</h3>
Explanation:
Synovial fluid is a viscous fluid found in the cavity of synovial joints. In terms of appearance the synovial fluid appears clear
, Colorless (pale yellow)
, viscous, microbes free.
Synovial fluid has following functions in our body
a) shock absorption
b) nutrient distribution
c) lubrication of the articular surfaces
d) waste disposal
