Answer:
I am a busy worker who is a water mammal.
The Titanic is still here. What am I?
I am the kind of nut that is empty at the center and has no shell.
I am seen in the water. If seen in the sky I am in the rainbow a jay's feather and lapis lazuli.
In buckles or lace I help set the pace. The farther you go the thinner I grow.
Why was the cook arrested?