Answer:
What is the freedom of birds and the pen of old men?
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
What is it that given one, you’ll have either two or none?
Looks like water, but it's heat. Sits on sand, lays on concrete. A play on the eyes, but it's all lies.
Twigs and spheres and poles and plates. Join and bind to reason make.
What covers its face with its hands, speaks no language, yet most known what it's saying?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?