The correct option is (A) Endoskeleton.
Endoskeleton is common between Echinoderms and chordata class.
What are the characterstics of Echinoderms?
- They are round or elongated and have a star-like appearance.
- They are only aquatic creatures having spiky skin.
- They have an open circulatory and digestive systems and demonstrate organ system level organization.
- They have a coelomic cavity and are triploblastic.
- The calcium carbonate that makes up the skeleton.
- They use their gills or the cloacal respiratory tree to breathe.
- They lack an excretory system and have a straightforward radial nerve system.
- With no recognizable head, the body is not segmented.
- The tube feet make moving around easier.
- Both sexual and asexual gametic fusion and regeneration are used in their sexual reproduction. External fertilization occurs during indirect development.
- They have the ability to regenerate.
- Their sensory organs are not very well developed. Chemoreceptors, tactile organs, terminal tentacles, etc. are a few of these.
Learn more about the Echinoderms with the help of the given link:
https://brainly.com/question/6472932
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