What does the following BrainBat signifies?

ABCDEFGHIJKLMNOPQRSTUVWYZ

QQQQQQQQQQQQQQQQQQQQQQQQQ.

If I remove one from eleven it becomes Ten and if I remove one from nine also becomes Ten. How?

I am under you when I am whole.
I shift above you if you remove the first letter.
I come all around you if you remove the second as well.

Can you tell me who I am?

If you say my name, I will no longer exist. What am I?

1 rabbit saw 9 elephants while going to the river. Every elephant saw 3 monkeys going toward the river. Each monkey had 1 parrot in each hand. How many animals are going towards the river?

Do You See It?

If six children and two dogs were under an umbrella, how come none of them got wet?

How many letters are in the alphabet?

A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

I am a type of vehicle that has two wheels and is powered by humans. What am I?
Hint 1: You can ride me for exercise.
Hint 2: I am environment-friendly.