What Deficiency does the below rebus represent?

VIT_MIN

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

Many have heard it, but nobody has ever seen it, and it will not speak back until spoken to. What is it?

A thief enters a store and threatens the clerk, forcing her to open the safe. The clerk says, “The code for the safe is different every day, and if you hurt me you’ll never get the code.” But the thief manages to guess the code on his own. How did he do it?

In the four images below, can you find the odd one out?

Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

What runs around the whole yard without moving?

There was a strange boy who was born before his father. How can this be possible?

What part of Turkey has the most feathers?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?