Answer:
I am a busy worker who is a water mammal.
You throw me out when you use me and take me in when you are done. What am I?
I am a rock group that has 4 members, all of whom are dead, one of which was assassinated. What am I?
When the clock has no angle, I will own yesterday, tomorrow and tonight. What am I?
My rings are not worth much, but they do tell my age. What am I?
What made Cyclops quit teaching?