The crinoids
A)have the most primitive characters.
B)have far fewer living species than are found in the fossil record.
C)include the shallow-water feather stars of tropical oceans.
D)include sea lilies that resemble a stalked flower.
E)all of the choices are correct.

Question

Quizplus · Accepted Answer

Crinoids, members of the phylum Echinodermata, are indeed considered to have primitive characteristics within their group. They have a rich fossil record with far more species known from fossils than are alive today. Among the living crinoids, feather stars (which can be found in shallow tropical waters) and sea lilies (which resemble stalked flowers) are included, making all the provided choices correct.

The Crinoids