Name the gas that naturally occurs in the air and screens out harmful rays from the sun?
Ozone (O3) forms from oxygen (O2) in the upper atmosphere and screens out most of the ultraviolet radiation from the Sun.
The boy's name Clay is of Old English origin. Occupational or place name involving clay; short form of Clayton. Clay that occurs naturally in the earth was a valued natural resource in earlier times. Boxing champion Muhammad Ali was named Cassius Clay after a 19th-century abolitionist, American statesman Henry Clay
Microorganisms in food that are viable when consumed and that are beneficial to health are known as?
if you're trying to say that microorganisms are part of the natural flora of the digestive tract, their name is "saprophites" (the food/medicine that contains them is called "probiotic"). the good thing with them is that they fit there naturally, preventing harmful bacteria from creeping in from the outside.
Xylitol is a sweetener that occurs naturally. It can be found, for instance, in berries, fruit, vegetables and mushrooms. The Finnish name for it, "koivusokeri", or "birch sugar", derives from the fact that the best way to make xylitol industrially is from birch, by chopping up and rendering down the structural fibre of the wood, xylan.