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1 March, 01:50

Which of the following organisms has a closed circulatory system?

a. Sponges

b. Cnidarians

c. Nematodes

d. Insects

e. Vertebrates

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  1. 1 March, 01:52
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    The correct answer is E. Vertebrates have a closed circulatory system.

    Explanation:

    The main mission of the circulatory system is to deliver oxygen and nutrients to all body cells.

    In the closed circulatory system, blood travels inside a network of blood vessels, without leaving them. The material transported by the blood reaches the tissues through diffusion. It is characteristic of all vertebrates, including humans.
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