PLEASE HELP! Scientists performed studies on mussels and clams. They placed these different species in fresh water that had contaminants commonly found in agricultural runoff and human and animal waste. Within a few days, the mussels and clams had removed the majority of the contaminants. How do these findings relate to ecosystem services in natural environments? A.
Introducing new species of mussels and clams will help reduce erosion and runoff into rivers.

B.
Increasing the biodiversity of mussels and clams in freshwater ecosystems will improve water quality.

C.
Growing mussels and clams in rivers will provide humans with a steady source of food.

D.
Using a single species of mussel or clam will remove greenhouse gasses from the atmosphere.

The answer is B I belive, hope this helps

"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."