How do bacteria get food and energy

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.

Which of the following describes a difference when gram-positive bacteria are compared to gram-negative bacteria?

What would happen if the tubing with the yellow band was placed in a beaker of distilled water?