<h3>The blood in the pulmonary artery is going to the heart to collect oxygen, and therefore has a low content of oxygen. So, the blood in the pulmonary artery is a violet colour because it has low oxygen. The blood in the pulmonary vein is oxygen rich, and so it gives a scarlet</h3>

Answer:
Lack of water and being unable to exercise
Explanation:
yea
Answer: white blood cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders
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