The Chaetognaths
A)have radial symmetry.
B)feed on clams.
C)are small ancestors of fish.
D)are mostly pelagic plankton feeders.
E)are solidly advanced deuterostomes.

Question

Quizplus · Accepted Answer

Chaetognaths are mostly pelagic plankton feeders, meaning they live in open water and feed on planktonic organisms. They have bilateral symmetry, not radial symmetry, and are not ancestors of fish. While they are considered deuterostomes (animals with a particular pattern of embryonic development), the term "advanced" is subjective and not applicable in this context.