Direction: First, browse the following statements. Then, read the fact sheet, "What Killed the Dinosaur?" Next, write T for true and F for false statements.  We knew that dinosaurs went extinct some 64-65 million ago by studying climate.   The "K" in the term of K-T extinction stands for Cretaceous period.   Scientists from many different fields are doing researches to prove the K-T extinction hypothesis.   The K-T extinction theory was proposed about five years ago.   The K-T extinction is the largest extinction in the history of life.   The ferns became prosperous while dinosaurs went extinct in the K-T extinction.   The largest group of organisms that disappeared from earth in the K-T extinction was that of  marine species.   After creatures die, they will definitely turn into different forms of fossils in the course of hundreds of  years.   The reasons for dinosaur extinction are still inconclusive because we do not know if dinosaurs died  suddenly in a catastrophe or if they just stopped generating offspring.   Paleoecology is a scientific study focusing on studying the reasons why dinosaurs died.