Question

Which of the following statements is true regarding echinoderms and chordates?

A) Echinoderms and chordates are both characterized by a notochord.

B) Echinoderms and chordates belong to the same phylum.

C) Echinoderms exhibit radial symmetry, while chordates exhibit bilateral symmetry.

D) Chordates are exclusively marine, while echinoderms can be found in terrestrial environments.

Answer 1

Echinoderms exhibit radial symmetry and are exclusively marine, while chordates exhibit bilateral symmetry and can be found in various environments, not just the marine.

Step-by-step explanation:

Among the options provided regarding the relationship between echinoderms and chordates, the true statement is that echinoderms exhibit radial symmetry, while chordates exhibit bilateral symmetry. Both echinoderms and chordates are part of the deuterostome superphylum. Echinoderms include creatures like sea stars and sea urchins, and feature pentaradial symmetry and unique ossicles making up their endoskeletons. In contrast, chordates, which include vertebrates along with some invertebrates like tunicates and lancelets, are characterized by features such as a notochord, dorsal hollow nerve cord, and pharyngeal slits. While chordates can be found in a variety of environments, including marine, terrestrial, and aerial, echinoderms are exclusively marine.