I'd say it's to set up a clear goal.
When it comes to blood circulation, a good and effective blood circulation is one that provides the body with a lot of nutrients - so what we want is for example an increased blood circulation to the body, but we don't want for example a decreased blood flow to some organs - those organs would then not receive the necessary nutrition. Healthy lifestyle provides good things to the body - so the answer is D, since it's the only good thing. Decreased area in blood vessels would again diminish the nutrition to some organs and a high blood pressure is also not good - it carries a risk of some diseases.
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Yes, it is true!!!!!!!!!!!!!!!
Small intestine. Nutrients are absorbed by microscopic villi, which transfer nutrients into the blood stream and surrounding cells. Hope this helps :D
