I have branches, but no fruit, trunk or leaves. What am I?

What happened when the wheel was invented?

There is a brick of gold and a brick of iron in a boat (both 10-inch blocks), if they are both dropped into the water which will make the water level higher?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What's a single-digit number with no value?

Can you find out what is missing?

1 3 5
2 4 ?

Hint: It's not six. Think out of the box.

Christina, Allison and Lena are 3 daughters of John a well-known Mathematician, When I asked John the age of their daughters. He replied "The current age of her daughters is prime. Also, the difference between their ages is also prime."

How old are the daughters?

By removing one matchstick and adding one matchstick, can you convert the word "ZOO" to an animal name?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"