17 a Identify four constants from this experiment 1. 2.
3.
4.

17 Explain why group A is not the control group

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.

Explain why the plants cortex would serve as the best food source for animals

The negative impacts of nonnative species generally outweigh the positive impacts