which is true about scientists?

Question

They don't have anything more to discover about how pliosaurs lived.
They don't have any ideas about what caused pliosaurs to become extinct.
They found out most facts about pliosaurs from studying living reptiles.
They learned most of what we know about pliosaurs by examining fossils.

Answer 1

The statement that is true about scientists in relation to pliosaurs is:

They learned most of what we know about pliosaurs by examining fossils.

Scientists primarily study fossils to understand the biology, behavior, and ecology of extinct species, including pliosaurs. Fossils provide valuable information about their anatomy, habitat, and how they might have lived. The other statements either make overly definitive claims or misrepresent the current understanding of pliosaurs. For instance, there are still ongoing discussions and research about the causes of extinction for many prehistoric species, including pliosaurs.