What has many keys but can’t open a single lock?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

Which is the correct shadow of the bird?

I am a type of food that is often found in the fridge and can be white in colour. What I am?
Hint 1: I am a dairy product.
Hint 2: You can spread me on the bread.

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

I am white when I am dirty, and black when I am clean. What am I?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

You Throw The Outside, Cook The Inside
Eat The Outside, Throw The Inside.

What Is It?

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?

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.