Nitrogen gas reacts with hydrogen gas to form ammonia. what are the reactants in this chemical reactions

The formula for this reaction would be

N + H3 ---> NH3

The first part of the reaction are the reactants and the second part is the product.

The reactants of this reaction are N and H3.

Or you could say the reactants are nitrogen and hydrogen

the answer is yes, they are born/created, then they grow to their limit then produce offspring, then die.

"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."