How do the feeding habits of Cecile echinoderms differ from those that are mobile?

Cecile echinoderms, such as sea lilies or feather stars, typically feed by filtering plankton and organic particles from the water using their feathery arms, which are often anchored to substrates. In contrast, mobile echinoderms like sea stars or sea urchins actively pursue food, often preying on other organisms or grazing on algae. This difference in feeding habits reflects their adaptations to their respective lifestyles, with cecile species relying on passive feeding mechanisms while mobile species exhibit more active foraging strategies.