Describe how plants and animals each contribute to the survival of the other. (This type of cooperative relationship is called interdependence.)

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.

Depending on the organism the number of in a cell may change

Which kingdom includes some organisms that have no nucleus and can live in an environment with an extremely high salt content