A diagram in the course handout shows that a stalked or feather-armed echinoderm filters food from water currents. Identify the related structure or process.

Crinoids include sea lilies and feather stars. They are suspension feeders and are considered among the more ancient-looking echinoderm forms. This MCQ belongs to the Crinoidea topic in Animal Diversity-I and is written to test concept understanding rather than memorized wording.