Does a high-fat meal raise or lower the level of cholecystokinin (cck) in the blood?

Which of the following claims does the author support the least

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.

Competition occurs between species when