The placenta (also known as afterbirth) is an organ that connects the developing fetus to the uterine
wall to allow nutrient uptake, provide thermo-regulation to the fetus,
waste elimination, and gas exchange via the mother's blood supply, fight
against internal infection and produce hormones to support pregnancy.
The placenta provides oxygen and nutrients to growing babies and removes
waste products from the baby's
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Explanation:
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It is important to stretch before exercising because for example if you were to be doing a strenuous workout it causes the blood vessels in your legs to expand. Which then causes more blood into your legs and feet. If you were to stop after a while of exercising your heart rate slows down and blood can pool into your lower body which could cause you to possibly faint.
D,it never acceptable to ignore rules or etiquette but A, when no one else notices you ignored the rules.
I’m pretty sure they included more than one independent variable.