The kidneys help to regulate the salt balance of the body. Normally, more than 99% of the sodium filtered at the is returned to the blood. Most of this sodium is reabsorbed at the .

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answer: although many types of viruses can cause a common cold, rhinoviruses are the most common culprit. a cold virus enters your body through your mouth, eyes or nose. the virus can spread through droplets in the air when someone who is sick coughs, sneezes or talks. theres your answer

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d.  

there was a variety of food available on island x, but there were only large seeds and nuts on island y.