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Two basic types of circulatory systems that have evolved over time?
Wiki User
∙ 14y ago
open and closed circulatory systems.
open system: the blood leaves the discrete vessels and bathes at least some non-vascular tissues directly. (crustaceans, mollusks, arthropods, etc.)
closed system: there is always at least a thin vessel wall separating the blood from the other tissues. (mammals,birds, etc.)
Wiki User
∙ 14y ago
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