What Adam and Eve do not have but the rest of the people have?

I am the black child of a white father, a wingless bird, flying even to the clouds of heaven. I give birth to tears of mourning in pupils that meet me, even though there is no cause for grief, and at once on my birth, I am dissolved into air. What am I?

A man stands on one side of a river, his dog on the other. The man calls his dog, who immediately crosses the river without getting wet and without using a bridge or a boat. How did the dog do it?

Replace the question mark in the picture below.

There are nine letters in the below-given diagram. You have to form a nine-letter word using these letters.

It walks on 4 when its young, walks on 2 when it's older, and walks on 3 when its very old?

The first person saw the bridge step on it and crossed,
the second person saw the bridge did not step on it but crossed,
the third person did not see the bridge did not step on it but crossed.
Who are these people?

The owner of a popular clothing store comes up with his own method of pricing items. A vest costs $8, socks cost $10, a tie costs $6, and a blouse costs $12. Using the owner’s method, how much would a pair of underwear cost?

I am a white box having no key or lid.
Yet there is a golden treasure inside it.

What Am I?

I am never scared but became petrified and can’t live in a house but would die to make one. What am I?