septum noun [C]. âº a âthin âpart âdividing âtissues or âspaces in an âorgan such as the ânose or âheart: the ânasal septum. (Definition of septum from the Cambridge Advanced Learnerâs Dictionary & Thesaurus Â© Cambridge University Press). Browse. 1  septic.
Unfortunately, the giant squid Architeuthis has not been studied enough to make a comprehensive diet. From the few that have been dissected though, it was discovered that they would eat sperm whales that dive deep underwater.
Scallops filter plankton from the water internally. Squid eat small fish which eat plankton, and even the mighty humpback whale dines on small fish which eat plankton. Higher on the food chain, sharks eat fish, which eat smaller fish, which eat plankton. Without zooplankton, small fish would starve, and without them, the larger fish would starve. So, nearly everything in the ocean somehow depends on the zooplankton.