a, because exercise doesn't just aid the prevention of certain diseases, it helps prevent many diseases. i would've chosen d if it wasn't so specific but a is the correct answer.
You should really include the article with the question. Makes it easier for those wanting to answer
They are listed according to their weight in the product. The first ingredient listed is the one in greatest quantity, followed by the next one, etc.
High CO2 levels in the blood may be caused my vomiting, dehydration,blood transfusions or overdose of medicines that contain bicarbonate
