Good Riddles

Question: Weight in my stomach,trees on my back,nails in my ribs,it's feet I lack.What am I?

Question: What is it that no man wants, but no man wants to lose?

Question: At night they come without being fetched, and by day they are lost without being stolen.

What are they?

Question: What is it that after you take away the whole, some still remains?

Question: What's the difference between a well-dressed man on a bicycle and a poorly-dressed man on a tricycle?