Q: Which is the most necessary item of consumption for human survival ?
A: Air. (without it we cannot remain alive for more than a very few minutes)
The easiest method of explaining my combination theory is by way of example of air. The most abundant material on the surface of earth. The ordinary (non-polluted) air is a mixture of a few gases namely Oxygen, Nitrogen, Hydrogen, Carbon dioxide as the dominant ones mixed with a few insignificant others.
The theory is pretty simple.
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