Nudibranchs, a type of predatory sea slug, can have various protuberances (i.e., extensions) on their dorsal surfaces. Rhinophores are paired structures, located close to the head, which bear many chemoreceptors. Dorsal plummules, usually located posteriorly, perform respiratory gas exchange. Cerata usually cover much of the dorsal surface and contain nematocysts at their tips.
-The small, thin extensions of the skin on the aboral surfaces of sea stars have a function most similar to that of
A) rhinophores.
B) dorsal plummules.
C) cerata.
D) more than one of these.

Question

Quizplus · Accepted Answer

The small, thin extensions of the skin on the aboral surfaces of sea stars perform respiratory gas exchange, similar to dorsal plummules on nudibranchs. Rhinophores and cerata are not related structures.

Nudibranchs, a Type of Predatory Sea Slug, Can Have Various