A scientist testing the effects of a chemical on apple production sprays an orchard with the chemical. A second orchard does not receive the chemical. In the fall the number of apples harvested from each forest is counted. The orchard sprayed with the chemical produces an average of 60 apples per tree, the other orchard produces an average of 40 apples per tree. What are some potential standardized variables from this experiment?

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /

because the light is a great source of energy for the plants to survive. (i hope this )

"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."