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Go to https://www.khanacademy.org/ and click on Courses in the top left corner. Find the course you need help with, and then choose which topic within that course's listings.
Hello! I'm having trouble with this question on my study guide about the phylum of echinoderms:
The individual calcareous elements that compose the water vascular system in echinoderms are ____.
I know that ossicles are made of calcium but they are a part of the echinoderm endoskeleton, and I don't think they are apart of the water vascular system. I have looked on google, but I have been unable to find anything helpful. Does anyone have an idea what this might be or where else I should look? Thank you :)
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