The phrase very weak may symbolize has very little support at the base.
Plankton refers to a variety of aquatic animals that cannot swim against a current. Plankton is made up of individual organisms called plankters. They are an essential food source for a variety of small and large aquatic creatures, such as bivalves, fish, and whales, in the ocean.
Primary consumers like zooplankton, tiny fish, and crabs ingest them. In turn, fish, small sharks, corals, and baleen whales consume the primary consumers.
They form the very basis of the food web, but their inability to propel against ocean currents can be the reason why they are phrased as very weak.
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