C. Gravity
I think its correct! Sorry if its not!
Are there choices? I would say the flu shot, but again, are there choices.
<span>At the very end of it, it divides into two tubes called bronchus, which together they are called a bronchi. which then it connects your trachea to your lungs.
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Tributaries is a river or stream that flows into a larger river or lake so ur answer is A
