Question Detail

ZOO 102 Foundations of Animal Systematics and Phylogeny Objective Question

Question

Why are echinoderms considered more complex than other simple animals, despite their radial appearance as adults?
Options
A They are protostomes
B They are deuterostomes, like chordates
Correct Answer
C They lack a true coelom
D They belong to the Parazoa group
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.

Question Info