In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: Some animals in this phylum have small skeletal-like projections called pedicellaria. Animals in this phylum that can be fossilized to form St. Cuthbert's beads are called crinoids. Scientists sometimes only classify animals in this phylum if they contain stereom skeletons. The feet of animals in this phylum, which contain ampulla and podia, are called tube feet. One of its subphyla is asterozoa, many of which have a five-point radial symmetry, while examples of these without such symmetry include sea urchins and sea cucumbers. Name this animal phylum whose members tend to be good at regeneration, and which includes starfish.
A:
Science