Physics is not a branch of natural "sciencie".
The answer is B and that is the same reason that everything stays on the Earth because it has very strong gravity.
Answer:
c
Explanation:
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The answer is urethra.
It is known that the kidneys are responsible for filtration of metabolic wastes from the blood and form urine. Urine is transported through the ureters to the urinary bladder. From the urinary bladder, urine is transported to the outside of the body by the urethra.
