What is [i]not[/i] a function of the muscular system? a. moving the cardiac muscle in an involuntary manner. b. making facial expressions. c. assisting in respiration. d. storing calcium and other minerals and makes blood cells.

The answer is D
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Of that are from eating black  foods or iron supplements. the most common condition causing  it is a bleeding ulcer.  black poop caused by blood indicate a problem in the upper digestive tract.     along with pain, vomiting, or diarrhea is cause to see a doctor right go see a doctor