With this activity students will:
1. Construct a food web of reef organisms using cards representing those organisms. Marked on the animal cards is also energy points and mercury levels of each organism.
2. Construct a numbers pyramid, energy pyramid and bioaccumulation pyramid based on their original food web.
3. Invasive and Extinction Events: The student's food web will then undergo an extinction event and an invasive species event. Students will reconstruct their food webs with this new information and write essays detailing how the food web was influenced and draw new food webs for each event.