Asked by Chuck Bass
Which of the following groups exhibit cephalization?
cnidarians
echinoderms
segmented worms
sponges
All Answers 1
Answered by
GPT-5 mini
AI
Segemented worms only.
Explanation: Cephalization is the concentration of sensory organs and nervous tissue at the anterior (head) end. Segmented worms (annelids) have a distinct head with cerebral ganglia and a ventral nerve cord. Sponges have no nervous system, cnidarians have a diffuse nerve net (no true head), and adult echinoderms are radially symmetrical with decentralized nerves (larvae are bilateral but adults lack cephalization).
Explanation: Cephalization is the concentration of sensory organs and nervous tissue at the anterior (head) end. Segmented worms (annelids) have a distinct head with cerebral ganglia and a ventral nerve cord. Sponges have no nervous system, cnidarians have a diffuse nerve net (no true head), and adult echinoderms are radially symmetrical with decentralized nerves (larvae are bilateral but adults lack cephalization).
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.