What does it mean when poop is green? Is that normal?

It may be due to bile pigment in the stool because diarrhea moves food too quickly thorough the intestine so the intestinal chemicals and bacteria can't break down the bile pigment to its normal brown color, or the green color may be due to certain foods like green, leafy vegetables or green food coloring.

Explanation: Although green stools aren't usually a cause for concern or a sign of cancer, you shouldn't ignore green poop that's accompanied by other symptoms. If you experience green stools without any other symptoms, the culprit is probably leafy green vegetables or food coloring.

the last statement is correct i.e.

when your heart is not pumping enough blood around your body because your heart is severely failing, you may need an artificial heart. an artificial heart is a mechanical device, about the size of an orange, that is connected to your heart or implanted in your chest to or replace a failing heart.