Long Riddles and Answers

Question: I was the first and now I am the one.

What am I?

Question: Mary's mother had 4 daughters. May, June, July, and.....?

Question: What's hard Smells like the ocean And is full of seamon

Question: The more i am present, the less you can see me. Who am i?

Question: If there's a pound of lead and feather, which is heavier?