Answer:
Before meiosis actually begins, the DNA that is packaged into chromosomes must be fully copied.
Maintain homeostasis - eg. blood sugar control by insulin and glucagon.<span>
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Answer:
<em>The kidneys act as very efficient filters for ridding the body of waste and toxic substances, and returning vitamins, amino acids, glucose, hormones and other vital substances into the bloodstream. The kidneys receive a high blood flow and this is filtered by very specialised blood vessels.</em>
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