Imagine that you are studying a new species.  As you examine…

Imagine that you are studying a new species.  As you examine the circulatory system, you note that the diameter of the vessels grows smaller and smaller as you move farther from the heart, but the blood is always contained within vessels.  If you want to place this new species into a group whose membership is solely based on whether the animals included share this described type of circulatory system, which animals would be included in this group? Check all that apply.