Answer:
A stellar five-Βlimbed sea creature.
What scientists might call your pooch.
What animal dwells in water and best known for its work ethic?
My first is twice in apple but not once in tart. My second is in liver but not in heart. My third is in giant and also in ghost. Whole I'm best when I am toast.
What can provide food before it is alive, while it is alive and after it's dead?
I break away from my pack. I create holes in my victims. I can travel for miles and then disappear. I am part of a dying breed. What am I?