Here's why:
* They use their tentacles to catch food: Sea anemones have stinging cells called nematocysts on their tentacles. These cells paralyze small prey like plankton, crustaceans, and even small fish.
* They don't actively chase prey: Instead, they wait for food to drift by and then use their tentacles to capture it.
* They filter out food particles from the water: Their tentacles are covered in mucus that traps food particles, which are then transported to the mouth.
In summary: Sea anemones rely on the currents to bring them food, which they then filter out of the water using their tentacles. This makes them suspension feeders.