Biology · ANIMAL KINGDOM

A unique feature of adult echinoderms compared to their larval stage is their body symmetry. Which statement correctly describes this symmetry shift along with their circulatory/excretory system features?

1. Adults are radially symmetrical, larvae are bilaterally symmetrical; Specialized excretory system is absent
2. Adults are bilaterally symmetrical, larvae are radially symmetrical; Excretory system is well developed
3. Both adults and larvae are radially symmetrical; Excretion occurs via Malpighian tubules
4. Adults are asymmetrical, larvae are radially symmetrical; Water vascular system functions exclusively for excretion