Why do we pee and do we have to do it

Answer and Explanation:

We pee because our body needs a way to get rid of the excess waste and water in our system. And, yes, we do need to pee. It's as natural as breathing. So, when we drink, what do we do? We pee. Simple.

When you feel the urge to pee and have to sprint to the bathroom in case you can't make it by walking, the brain signals the bladder muscles to tighten, squeezing urine out of the bladder. At the same time, though, the brain signals the sphincter muscles to relax, and so, as these muscles relax, urine exits the bladder through the urethra. When all the signals happen in the correct order, normal urination, or peeing, occurs.

"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."

i think the answer is b.