Easy Riddles and Answers

Question: I have no heart Yet I can live Even if I have fallen Fires are my enemy You are my enemy

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: 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?