What is the advantage of a closed circulatory system over an open one?

answer:

It provides more power in the form of pressure.

Compared to the open circulatory system, the closed circulatory system operates with much higher blood pressure, though it is said to be more efficient considering that it uses much less blood for even faster and higher levels of distribution.

Explanation:

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there is not 1 highest source of protein, but there are many; meats, fish, poultry, seafood, cheese, eggs, yogurt and milk. the only non complete animal food that is beneficial is gelatin.

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ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )