I am a Mammal

I have 4 corners. I have 4 sides.

All of my sides are the same length.

Who I am?

I am the nearest planet to the sun.

I am the smallest planet in the solar system.

Who am I?

Can you name the four days of the week that begin with letter "T"

It is purple. It is Long.

It is a softer vegetable. It grows from a plant.

What is it?

I am the fifth planet from the sun.

I am the fastest spinning planet in the solar system.

Who am I?