Answer:
I am rubber you can eat!
I am an odd number. Take away one letter and I become even. What number am I?
I have cities but no houses I have mountains but no trees I have water but no fish. What am I?
Take off my skin I won't cry but you will.
I'm blue at day and black at night. I do contain some creatures born and died. What am I?
No matter how little or how much you use me, you change me every month.