What does below rebus means ?

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

What can jump higher than a building?

What does below chemistry rebus means?

What is the unique property of the following words ?
* Revive
* Banana
* Grammar
* Voodoo
* Assess
* Potato
* Dresser
* Uneven

You can find some missing letters in the picture. By placing two particular letters in the spaces, you can form a nine lettered word beginning from one of the corners and going clockwise direction to the middle. Can you find out the letters and the word?

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?

Andrew’s doctor gives him three pills and tells him to take one every half hour. How much time will have passed by the time Andrew’s taken all three pills?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

I have a hole in my back and legs I lack.
I live where I can’t breathe and I eat without teeth.
What am I?