Answer:
The day is their night and the night is their day, when I shout and they shout back I run away.
What is it that no man ever saw, which never was, but always will be?
Some adults still use these to count.
What is used by man, tossed by trees, everywhere but unseen?
Without this, H2O would just be 2O
What is big and yellow and comes in the morning, to brighten mom's day?