- Fossils are formed when layers of sediment cover the remains of organisms over time
- A plant is a kind of organism
- An animal is a kind of organism
- Hence, fossils are formed when layers of sediment cover the remains of plants and animals over time

Therefore, fossils are formed when layers of sediment cover the remains of plants and animals over time
[Question]Paleontologists often find and study the remains of ancient plants and animals. When the remains of ancient plants and animals are covered by layers of sediment over time, the remains
[Context]- Fossils are formed when layers of sediment cover the remains of organisms over time 
- A plant is a kind of organism 
- An animal is a kind of organism