What Deficiency does the below rebus represent?

VIT_MIN

I have a big mouth and I am also quite loud! I am NOT a gossip but I do get involved with everyone's dirty business.

Can you find out the missing number?

? 4 5 3 5

9 5 7 10 3

There is a straight highway. Four different villages lie on that highway. The distance between them is different. The third village is 60km away from the first village; the fourth is 40 km away from the second; the third is 10 km near to the fourth that it is to the second.

Can you calculate the distance between the fourth and the first village ?

What goes up but never comes down?

I am a word that begins with the letter “i.” If you add the letter “a” to me, I become a new word with a different meaning, but that sounds exactly the same. What word am I?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I have an eye but still cannot see.

Who am I?

I shave every day, but my beard stays the same. What am I?

Can you spot the hidden girl in the picture below?