Question Detail
Question
Why are echinoderms considered more complex than other simple animals, despite their radial appearance as adults?
Correct Answer
Option B is the correct answer.
Detailed Explanation
Echinoderms are grouped with chordates as deuterostomes, reflecting a more complex developmental pathway than protostomes. They are not Parazoa (which lack tissues).
Hint
They share a developmental category with humans.