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4 March, 04:38

Which is an organ?

1 heart

2 circulatory system

3 blood

4 muscle tissue

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Answers (2)
  1. 4 March, 05:04
    0
    The heart is an organ

    Explanation:

    The circulatory system is just that a system.

    Blood is just the liquid inside the circulatory system.

    Muscle tissue is what makes up the heart along with other muscles and organs.
  2. 4 March, 05:23
    0
    The heart is an organ
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