Answer:
Tear one off and scratch my head what was red is black instead. What is it?
The 8 of us go forth and not back to protect our king from a foe's attack. What am I?
Until I am measured, I am not known. Yet, how you miss me when I have flown. What Am I?
What can travel around the world while staying in a corner?
I am a word. I become longer when the third letter is removed. What am I?
No matter how little or how much you use me, you change me every month.