Pronounced as one letter,
And written with three,
Two letters there are,
And two only in me.
I am double, I am single,
I am black blue and grey,
I am read from both ends,
And the same either way.

I am a five-letter word and comprises two different vowels and three same consonants. I am so strong that I can spoil your entire work.

Can you find out who am I?

I live in a bowl. I can swim. I have a tail. I also have fins and big eyes. 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?

I am soft and cuddly that soothe your heart. But, If you pick my last name I am going to tear you all apart. Who am I?

You may enter, but you may not come in. I have space, but no room. I have keys, but open no lock. What am I?

The dirtier I get, the whiter I look. Who am I?

I am the beginning of the end, and the end of time and space. I am essential to creation, and I surround every place. What am I?

I sleep during the day and fly at night, but I have no feathers to aid my flight. What am I?

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.