Starfish have a unique form of digestion in the animal kingdom and a water-vascular system that allows the animal to breathe.
All your answers should be in this article:
http://animals.mom.me/feeding-respiration-starfish-6596.html
let me do my research real fast and I will let you know what I find
1. How many muscles are in the human body?
2.What diseases affect the muscular system?
3. What are the functions of the muscular system?
4.what are two types of muscle fibre?
I belive that the emperor penguin fits all the criteria of Group B.