How does a virus get itself into the human immune system? How does it make us sick?

Explanation:

here is how Viruses make us sick by killing cells or disrupting cell function. Our bodies often respond with fever (heat inactivates many viruses), with the secretion of a chemical called interferon (which blocks viruses from reproducing), or by marshaling the immune system's antibodies and other cells to target the invader.

Viruses make us sick by killing cells or disrupting cell function.

Explanation:

indium, and thallium have three electrons i think

the correct answer is:

a. formation of precipitation