Photosynthesis for co2 and o2. process!!
Not sure but my best guess is to go with B. It just makes the most sense.
Answer: Gastroenterology
Explanation: Gastroenterology is a branch of medicine concerned with digestive diseases. The practice of gastroenterology concentrates on the diagnosis and treatment of diseases involving the esophagus, stomach, small intestine, and large intestine (colon), liver, and pancreas. Examples of conditions treated: Abdominal pain.
Answer:
Some don't because of many things, disease and not getting enough food.
Explanation:
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