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

Multiple Choice

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

A) changes in the abundance of diatoms, one of their main food sources.
B) changes in the abundance of diatoms, which serve as food for animals that were preyed upon by cetaceans.
C) changes in sea temperature.
D) rising pollution levels in the ocean.
E) changes in the abundance of organisms that prey on cetaceans.