* Plankton are tiny organisms that drift in the water, and they are primarily eaten by smaller fish and invertebrates.
* Big sharks are apex predators, meaning they are at the top of the food chain. They primarily eat larger prey like fish, seals, sea lions, and other sharks.
Some sharks, like whale sharks and basking sharks, are filter feeders and do consume plankton, but they are much larger than the typical "big shark" that you might be thinking of.