Please I need help on these question ASAP

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

What field of science did harry hess study?

Melting glaciers is a serious threat to the environment what is the possible consequence of melting glaciers on polar bears?