What does this rebus riddle means ?

Spot 5 differences in two Christmas tree below:

Whats the next number in the below number sequence pattern.

I look at you, you look at me, I raise my right, you raise your left. What am I?

John was a very careless driver, so his owner Jacob gave him an offer that he will get an incentive of Rs.30 for every bottle box he delivered without breaking it and he will be charged Rs.90 for every bottle box he broke. Jacob gave John 100 bottles-box to deliver. After delivery, Jacob paid John Rs.2400. How many bottles-box did John break?

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?

I am weightless, but you can see me. Put me in a bucket, and I'll make it lighter. What am I?

A man calls his dog from the opposite side of a river. The dog crosses the river without a bridge or a boat and manages to not get wet. How is this possible?

What has 13 hearts but no other organs?

It has a long neck, A name of a bird, Feeds on cargo of ships, It's not alive,

What is it?