The answer is letter a because that is very true if you get hooked on that it can and most likely will lead to death.
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I believe the answer is:
Aorta, Left Ventricle, Left Atrium, Pulmonary Vein, Coronary Artery, <span>Bronchial veins.
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-Belle</span>
<span>After a fetus has developed for three months, what is its skeleton made of :
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<span>The bones will be formed from the centers of ossification, cartilage will gradually be replaced by bone. during this time, ossification of the spine <span>continues.
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