Can someone help me with bio

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.

The negative change found inside the plasma membrane is created by potassium ions sodium ions hydrogen ions chlorine ions

Long-period comets come from the oort cloud particles in earth’s atmosphere material from the asteroid belt the kuiper belt