Answer:
In American football, a safety is scored when any of the following conditions occur: The ball carrier is tackled or forced out of bounds in his own end zone. The ball becomes dead in the end zone, with the exception of an incomplete forward pass, and the defending team is responsible for it being there.
The main artery of the body, supplying oxygenated blood to the circulatory system is the aorta. The aorta branches into smaller arteries which carry oxygen rich blood all the way to the entire heart muscle.
Hope this is the answer you were looking for. Oh and I didn’t copy off of google, I used what I learned from science class.
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