Answer:
What grows when it eats, but dies when it drinks?
Is always in front of you but cannot be seen?
I'm the start of eternity and the end of space. There are two of me in heaven and one in hell.
What has many keys but cannot open a single lock or door?
Not my sister nor my brother but still the child of my mother and father. Who am I?
People take me on walks and I run and have fun. What am I?