Most of the ways to stop invasive animal species from entering the Great Lakes ecosystem is starting with people themselves. try not to plant anything that would be invasive to the echo system and also try helping out by cleaning out the Great Lakes by picking up litter and so forth
Answer:
The higher levels in the pyramid will receive less energy.
The lower levels in the pyramid will have less predation.
I want to say the liver and/or kidneys . . .
