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.
It's red liquid but not liquid and it's not red. What is it?
I am a busy worker who is a water mammal.
Die without me, never thank me. Walk right through me, never feel me. What am I?
What is easy to get into but hard to get out of?
What made Cyclops quit teaching?