- Bones are part of some animals
- Animals are a kind of organism
- Hence, bones are part of organisms

- Animals are a kind of organism
- A shell is a part of some animals
- Therefore, shells are part of some organisms

- Bones are part of organisms
- Shells are part of some organisms
- Fossils are the remains of organisms or part of organisms
- Plants are a kind of organism
- So, bones remains, shells remians, and plants remains are fossils

- Bones remains, shells remians, and plants remains are fossils
- Containing fossils is a kind of characteristic of sedimentary rock
- Hence, if a rock contains bones remains, shells remians, or plants remains, then the rock is a sedimentary rock

Therefore, if a rock contains bones remains, shells remians, or plants remains, then the rock is a sedimentary rock
Question: Rocks that contain fragments of bones, shells, and plant remains are most likely
Context: - Fossils are the remains of organisms or part of organisms 
- Bones are part of some animals 
- Plants are a kind of organism 
- Animals are a kind of organism 
- A shell is a part of some animals 
- Containing fossils is a kind of characteristic of sedimentary rock