Good Riddles

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: What can you do with your mind, and have in your heart; What makes music in your purse, and is not the same from the start?

Question: I know all, have seen all, yet I am not conscious. Looking back upon me shows mistakes and also good things. Looking in the middle of me shows opportunities to be exploited. Looking forward upon me shows the effects of decision. 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?

Question: There are five fish in a fish tank. Two swim away, one swims towards the ocean, and two die. How many fish are left in the tank?