Which of the following statements about the phylum Echinodermata is true?

• A. Many species possess an internal calcareous skeleton and spiny dermal projections.
• B. Larval forms show evidence of bilateral symmetry, which is mostly lost in the adult form.
• C. One of the clades in this phylum is Asteroidea, which includes the sea stars and sea daisies.
• D. All possess a water vascular system, which permits movements via tube feet.
• E. All of the listed responses are correct.

Answer: (E)

Verified step by step guidance

1. Identify the key characteristics of the phylum Echinodermata. This phylum is known for its unique features such as an internal calcareous skeleton, spiny skin, and a water vascular system.
2. Examine the symmetry in echinoderms. While adult echinoderms typically exhibit radial symmetry, their larval forms often display bilateral symmetry, which is an important evolutionary trait.
3. Understand the classification within Echinodermata. The clade Asteroidea includes well-known members like sea stars and sea daisies, which are part of this diverse phylum.
4. Explore the function of the water vascular system in echinoderms. This system is crucial for their movement, as it operates the tube feet that allow them to navigate their environment.
5. Conclude by evaluating each statement provided in the problem. Since all statements accurately describe features of the phylum Echinodermata, the correct answer is that all of the listed responses are correct.