Do echinoderms have respiratory and circulatory systems?

Do echinoderms have respiratory and circulatory systems?
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In echinoderms there are not well-defined respiratory (with the exception of the holothurian group) and circulatory systems. The ambulacral hydrovascular system plays the function of these systems.
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Echinoderms and chordates have

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Are echinoderms endothermic?

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Evolutionarily protochordates may be intermediate animals between invertebrates and vertebrates. Imagine a scientist is testing the hypothesis that vertebrates evolved from echinoderms. Having as research object a newly found protochordate species, what is an example of a discovery that would weaken the hypothesis? What is an example of a discovery that would strengthen it?

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Do echinoderms have an excretory system? How is excretion done in these animals?

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What is the embryonic characteristic that evolutionarily makes echinoderms proximal to chordates?

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What is the system that permits movement and fixation to echinoderms?

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How can the endoskeleton of echinoderms be characterized in comparison to analogous structures present in vertebrates, arthropods and molluscs?

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Last Answer : Echinoderms, as the name indicates (echino = spiny, derma = skin), are creatures with spines originated from an endoskeleton. Their endoskeleton is made of calcareous plaques that besides spines ... have pentaradial symmetry; the radial symmetry in these animals is secondary, present only in adults.

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Last Answer : Echinoderms are marine animals, they live in salt water.

The canal system is a characteristic feature of (a) echinoderms (b) sponges (c) helminthes (d) coelenterates.

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Last Answer : (b) sponges

Select the taxon mentioned that represents both marine and fresh water species. (a) Echinoderms (b) Ctenophora (c) Cephalochordata (d) Cnidaria

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Why do Cnidaria not need respiratory or excretory systems?

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How does the excretory and respiratory systems interact?

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Last Answer : What is the answer ?

Sea turtles, dolphins, and whales all live in the ocean. How do the respiratory systems of these three types of animals limit their behavior?

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Last Answer : They must swim to the surface to breathe because their lungs require air and not water.