- Fossils can be used to study the history of organisms and environments on earth
- An animal is a kind of organism
- Therefore, fossils can be used to study the history of animals and environments on earth

- Fossils can be used to study the history of animals and environments on earth
- A dinosaur is a kind of extinct animal
- Therefore, fossils can be used to study the history of dinosaurs and environments on earth

Therefore, fossils can be used to study the history of dinosaurs and environments on earth
Question
In 1971, the bones of an extinct flying dinosaur were discovered. This kind of discovery helps everyone learn more about

Context
- Fossils can be used to study the history of organisms and environments on earth 
- An animal is a kind of organism 
- A dinosaur is a kind of extinct animal