Answer:
Take away my first letter take away my second letter take away all my letters and I would remain the same.
I am an object which is used in baseball. During the day I can't be seen at all. What am I?
I always follow you around, everywhere you go at night. I look very bright to people, but I can make the sun dark. What am I?
I transfer oxygen from the atmosphere to your blood
Sing me to a baby about to go to sleep.
Give it food and it will live, give it water and it will die.