I believe the answer is -Reduces the risk of many diseases, including cancer-
Your nephrons help remove excess water, wastes and other substances from your blood, return substances like sodium, potassium or phosphorus whenever any of these substances run low in your body.
4, true
5, false.
6, true
7, true
hope this helps!
"Vaccination works to stimulate a specific immune response that will create memory B and T cells specific to a certain pathogen. These memory cells persist in the body and can lead to a quick and effective response should the body encounter the pathogen again."
its the same idea...
