Because they help you get healthy so that you will have a healthy body and a great healthy diet.
Sodium ions help control blood flow, blood volume, osmotic balance, and pH.
The second option is correct. If that person is infected, any sexual relation with him/her will get you infected.
Answer:

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A good procedure is so detailed and complete that it lets someone else duplicate your experiment exactly. Repeating a science experiment is an important step to verify that your results are consistent and not just an accident. For a typical experiment, you should plan to repeat it at least three times (more is better).