Oxygen and hydrogen, because they are used for water, which is needed for all life as we know it.
The element Q doesn't exist.
yes, it is used in most hair dyes to give the color extra shine
Dubnium. It is a synthetic element that does not exist in the environment. It has no uses whatsoever.
The symbol L for a chemical element doesn't exist.
If you mean do the exist as single atoms, no. Some can exist as molecules. Hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, and iodine usually exist as the diatomic molecules H2, N2, O2, F2, Cl2, Br2, and I2 respectively. Oxygen can also exist as O3. Phosphorus can exist as P4 and arsenic as As4. Sulfur is usually found as S8. Carbon can exist as C60 and a variety of similar molecules.
Of all the things on which life depends, the thing that almost certainly required for life to exist is water.
It is real in the sense that it did exist, but if you mean is it still around then tragically almost certainly not.
The unique properties of water enable all life to exist. To tamper with any of the properties and/or behaviors of water would almost certainly not support life on this planet.
The unique properties of water enable all life to exist. To tamper with any of the properties and/or behaviors of water would almost certainly not support life on this planet.
NO! He certainly did exist.
Ununoctium exist as an artificial chemical element.
The element Q doesn't exist.
Certainly. There is a chance that the earth will cease to exist.
No they do not exist, and no you certainly shouldn't worry about them.
If it does I certainly can't find it!
Yes.
No. Although there may one have been life on Mars, it would have consisted of tiny, single-celled organisms. If life did exist on Mars, it almost certainly died out long ago.