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Nope!!! Some do but not all. All animals do though. Plants that do are called vasculer. Those that don't are invascular. Moss, algea, and others are invascular.

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8y ago
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13y ago

yes.

For some it is open while for others, it is closed.

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14y ago

Because we are too big for all the cells in our body to be oxygenated and fed by simple diffusion form the environment so the circualtor system supples all the cells with what they need.

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12y ago

I think so but I am unsure

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13y ago

Yes.

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Wiki User

10y ago

yes

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Q: Do dogs have closed circulatory systems?
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All bird species have different circulatory systems, for the most part the smaller species have an open system, while larger birds have a closed system.


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