- A shark is a kind of fish
- A fish is a kind of aquatic animal
- Hence, a shark is a kind of aquatic animal

- A shark is a kind of aquatic animal
- If fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past
- Hence, if fossils of sharks are found in a place then that place used to be covered by water in the past

- If fossils of sharks are found in a place then that place used to be covered by water in the past
- Sharks live in oceans
- An ocean is a kind of body of water
- Hence, if fossils of sharks are found in a place then that place used to be covered by oceans in the past

- If fossils of sharks are found in a place then that place used to be covered by oceans in the past
- Fossils of sharks are found on top of a mountain
- The top of a mountain is a kind of place
- Therefore, the mountain used to be covered by oceans in the past

Therefore, the mountain used to be covered by oceans in the past
Question
A researcher found shark fossils on top of a mountain. This evidence suggests which of the following about this region?

Context
- Fossils of sharks are found on top of a mountain 
- Sharks live in oceans 
- A shark is a kind of fish 
- If fossils of an aquatic animal or plant are found in a place then that place used to be covered by water in the past 
- The top of a mountain is a kind of place 
- An ocean is a kind of body of water 
- A fish is a kind of aquatic animal