What Deficiency does the below rebus represent?

VIT_MIN

Can you place six X (crosses) in below board without making three in a row in any way ?

When Jack was six years old he hammered a nail into his favourite tree to mark his height. Ten years later at age sixteen, Jack returned to see how much higher the nail was. If the tree grew by five centimetres each year, how much higher would the nail be?

When it's bad luck to meet a black cat?

What word is identified by the below rebus?

Your Your Your Your Your
Your Your Your Your Your

No matter how little or how much you use me, you change me every month. What am I?

A dead body is found outside a multi-story multinational company. The case is reported and a homicide detective is called on the crime scene.

He looks at the body and then towards the building. From the position of the body, it is evident that the victim committed suicide. He goes to the first floor of the building and then walks in the direction of the dead body, opens the window and toss a coin in the air.

He goes to second floor and again repeats the process. He keeps doing this till he is done on all the floors. Then he returns back to the floor and tells his team that it is a murder.

How in heaven did he deduce that?

What can go through glass without breaking it?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

A father's child, a mother's child, yet no one's son.

Who am I?