The ___ Echinoderm lineage is made up of sea urchins and sand dollars, whose ossicles are fused into solid tests that restrict flexibility but provide excellent protection.

Question

Quizplus · Accepted Answer

Echinoidea is the correct answer because it refers to the class of echinoderms that includes sea urchins and sand dollars, characterized by their fused ossicles forming a solid structure known as a test.

The ___ Echinoderm Lineage Is Made Up of Sea Urchins