Angel has asked Sue to a dance. Angel is handsome and popular, but he is always making fun of others and Sue feels belittled by
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<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>