The answer is the 1st one, immune system and circulatory. If u need a reason then it’s because the immune system fights off diseases and infections, keeping your body safe. While the circulatory pumps blood from your heart and rest of the body, pumping white blood cells around the body to protect it.
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The closer you are to the equator the warmer it gets and vice versa the farther you get the colder it gets.
Answer: renal vein
<span>Urine passes thru large channels called (ducts) which drain into the renal pelvis or (inner part of the kidney). Next, the urine passes thru a ureter then afterward goes from each kidney to the bladder. Urine is then stored in the bladder while the “cleaned' (filtered) blood” from each kidney go into a large blood vessel called the renal vein. This vein gets the blood back to the heart.</span>
Early hypothesis was not based on experimentation