Good grief.<quoted text>
Why is hydrogen the lightest and simplest element? Could it be the first element created? Why is it abundant in the universe? Why is hydrogen bond very important in the overall stability of DNA? Hydrogen can give answers to the questions about how life started and the universe if scientists can discover how the simplest element was formed.
Yes, hydrogen is the simplest element, and the lightest because of that.
It's commonest because of that, too.
And, as you might not know, its formation is fairly well documented at about T0 +400,000.