- Nearly all fossils are found in sedimentary rock
- If something is found in something else then that something else contains that something
- So, sedimentary rocks can contain fossils

- Sedimentary rocks can contain fossils
- Metamorphic rocks do not contain fossils
- Hence, sedimentary rocks can contain fossils and metamorphic rocks do not contain fossils

- Sedimentary is a class of rock
- Metamorphic is a class of rock
- Hence, sedimentary and metamorphic are classes of rock

- Sedimentary and metamorphic are classes of rock
- Formation in the rock cycle means an old class of rocks changes into a new class of rocks
- Hence, formation in the rock cycle can mean sedimentary rock changes into metamorphic rock

- Sedimentary rocks can contain fossils and metamorphic rocks do not contain fossils
- Formation in the rock cycle can mean sedimentary rock changes into metamorphic rock
- Therefore, in the rock cycle, sedimentary rocks that contain fossils can be changed into metamorphic rocks that do not contain fossils

- In the rock cycle, sedimentary rocks that contain fossils can be changed into metamorphic rocks that do not contain fossils
- If something that contains a thing is changed into something else that doesn't contain that thing, then that thing is lost / destroyed when that something changes into that something else
- Therefore, fossils are lost / destroyed when sedimentary rock changes to metamorphic rock

- Fossils are lost / destroyed when sedimentary rock changes to metamorphic rock
- If fossils are destroyed in rock transition , then there will be gaps in the fossil record
- Therefore, sedimentary rock changing to metamorphic rock causes gaps in the fossil record

Hence, sedimentary rock changing to metamorphic rock causes gaps in the fossil record
Q: Which transition is most responsible for gaps in the fossil record?
Context:
- If something that contains a thing is changed into something else that doesn't contain that thing, then that thing is lost / destroyed when that something changes into that something else 
- Metamorphic rocks do not contain fossils 
- Nearly all fossils are found in sedimentary rock 
- If something is found in something else then that something else contains that something 
- Sedimentary is a class of rock 
- Metamorphic is a class of rock 
- Formation in the rock cycle means an old class of rocks changes into a new class of rocks 
- If fossils are destroyed in rock transition , then there will be gaps in the fossil record