Answer:
Hope it helps
Step-by-step explanation:
1. Phytoplankton is the main source of energy.
2. Algae--> Limpet--> Starfish --> Shark (I am not sure about this answer )
3. Limpets (not sure, sorry) I think there are more than one in this, like Mussel, zooplankton...
4. Starfish
5. Shark
6. Bacteria
7. No, energy cant be recycled back into the food web.
I tried my best to answer. Hope it will help you.