Answer:
I am perfect with a head perfect without a head; Perfect with a tail perfect without a tail; Perfect with either neither or both.
I save lives on the ground and in the air
What kind of cheese is made backwards?
I am partially baked. I am not completely lit. I am a portion of the moon. I am lesser than full wit. I am a divider of the hour. I am not a total lie. I am a sibling through one parent.
I can wake you up in the morning but I require no electricity or winding.
Whoever made me don't want me. Whoever bought me don't need me. Whoever use me don't know me.