Although there are other ways energy can be transferred from one place to another, radiation is the only way energy can get from the sun to the Earth. Why is this? A. Only radiation can cover such large distances as those between the Earth and the sun.

B. Only radiation does not require matter and there are no particles in open space.

C. The sun only emits energy in the form of radiation.

D. Radiation is not the only way energy moves from the sun to the Earth.

I believe it's C, but I'm not sure.

it's     c       this is a cell (b) with a nucleus (c) containing dna (a). the dna is organized into chromosomes (d). a section of the chromosome that codes for a trait is called a gene (e).

"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."