The more of this there is, the less you see. What is it?

Can you find the missing piece of the Porsche?

I am taken from a mine and shut up in a wooden case, from which I am never released, and yet I am used by almost every person. What am I?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

He does not have any heart but still, He manages to live.
If you kill him, you will eventually die but yet you kill him.
He cannot run, who is He?

O_er_t_o_

Complete the missing letters of the given word.

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

I’m tall when I’m young, and I’m short when I’m old. What am I?