Good Riddles

Question: A man builds a rectangular house. After he builds the house he wants to place a clock on a south wall. Because there are so many south walls he places the clock on a random wall. He sits in front of the sits in front of the clock for ten minutes until he hears a knock on his font door. The man opens the door to see a bear on his front porch. The bear kills him. What color was the bear and why?

Question: What is it that you have that no one else has?

Question: What number is odd but then when i get one letter from it turns into EVEN

Question: im fast and slow I go everywhere you go yet you cannot see me im in tree's in the sky in plants and in your body pretty much you need me to survive what am I?

Question: If a year has 365 days and a leap year has 366 days, then according to time, how many days in a year would have 24 hours?