From examining the fossil record, scientists have postulated that long-term historic changes in cetacean diversity depended on

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Cetaceans primarily feed on fish and squid, not directly on diatoms. However, diatoms are a crucial part of the marine food web, serving as a primary food source for many small marine organisms, which in turn are preyed upon by cetaceans. Thus, changes in the abundance of diatoms can indirectly affect cetacean diversity by influencing the availability of their prey.

From Examining the Fossil Record, Scientists Have Postulated That Long-Term