ichthyosaurs

"He was a marine in World War II."

"Overhunting can extinct entire species of animals. "

"The museum displayed fossils of dinosaurs that lived millions of years ago. "

"The family owns several, a small plot of land behind their house. "

"Scientists study plants to understand how they grow. "

"The marine biologist observed a playful porpoise near the research vessel. "

"The Cretaceous period saw the development of abundant chalk formations. "

"The city's population is over two millions. "

"There was a period of confusion following the announcement."

"The somewhat of extra help she received from her tutor significantly improved her test scores. "

"The zoo has a special building just for reptiles, like snakes and lizards. "

"The order of the books on the shelf was alphabetical by author. "