Understanding the portion control to avoid overeating

Answerspermicides;

The alveoli are what give the lungs so much space, and if they are big, there is more gas exchange than if they are small.

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