Do you have a full detailed question? Or perhaps a photo of the question?
Plankton exists near the bottom of the ocean's food chain and provides nutrition for whales, shrimp, snail, and jellyfish. Plankton also plays an important role in the carbon cycle by removing inorganic carbon dioxide due to photosynthesis.
From the deepest to most superficial: pia mater, arahnoid, dura mater
