Echinoderms are defined as various invertebrate marine animals characterized by a hard, spiny covering or skin. They have attracted much attention due to their extensive fossil record, ecological importance, and unusual body forms. Although most echinoderms are extinct, many living representatives still exist. All living echinoderms have an internal skeleton and a central body cavity, but their outward appearance can vary significantly. For example, starfish and brittle stars have arms that extend from a central disk; sea lilies have a central stalk, or stem, and resemble flowers; and sea cucumbers are wormlike and tend to burrow. The ways in which echinoderms move and feed are as diverse as their body forms. Table 1 lists certain echinoderms and their methods of locomotion (movement) and feeding. Table 2 includes examples of echinoderm habitats around the world. According to Table 1 and Table 2, crinoids can be found feeding on plankton.

Correct answer: C. in offshore mud and ooze

A. near the shore
B. in deep ocean trenches
C. in offshore mud and ooze
D. on the deep-sea floor

Explanation

The correct answer is C. According to Table 1, sea lilies are classified as crinoids. Table 2 specifies that sea lilies are typically found in offshore mud and ooze, thereby supporting answer choice C. The other options are incorrect because the habitats mentioned do not align with the details provided in Table 2 regarding crinoid habitats.

Last updated 3 September 2026

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