Answer:
Circadian rhythm, or circadian clock, is an internal biological clock that regulates sleeping and feeding patterns, as well as a whole host of other biological functions in all living organisms. Organisms most active in the daytime are diurnal, humans included, whereas nocturnal organisms come alive at night.
The correct answer is <span>(12) It was started in 2009 by actor Matt Damon and Gary White, the co-founder of Water partners. The word that should be capitalized is partners: Water Partners. The noun "partner" is normally a common noun, which means it shouldn't be capitalized in normal circumstances. However, here it represents the name of a company which is called Water Partners. It is just like with Warner Brothers (even though it's abbreviated as Warner Bros) - brothers is normally a common noun, but in this case, it is part of the company's name.</span>
