Asked by peyton

I am doing a project on echinoderm and one of the questions is asking about if they have a circulatory system. I have found information that they have a poorly defined opened circulatory system. I also need to answer the difference between if it's closed or open and this I don't understand? Could someone please help!!! thanks
Answered by Gray
bioweb .wku .edu/courses/biol225/225lab9 .html

gsu .edu/~bioasx/closeopen .html

According to the first article, they don't have circulatory systems at all, and I assume that's because they do not have a heart.

Remove the spaces to access the webpages.
Answered by Anonymous
it is open listen to me everyone calls me anerd and dork that's mean but true and please listen to me and you will qet a good qrade
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