What is the main function of the immune system? A. keeps you healthy

B. regulates your blood flow

C. removes waste (i. e. urine and sweat)

D. allows you to move

A. keeps you healthy

Explanation:

The immune system protects your body from outside "invaders," such as bacteria, viruses, fungi, and toxins.

A. keeps you healthy

Explanation:

The main function of the immune system is to keep you healthy. Protecting us is the duty of the immune system.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."

b. read the phase at the intersection of any given temperature and pressure.