C is the answer.
Metamorphic rocks is when a rock changes under time and lots of pressure.
Sedimentary is rocks made of sediment.
Igneous rocks are rocks that are made of magma.
Knowing this, C is closest to the definition of metamorphic rocks.
Buffers in our blood are able to neutralize changes in the bloods pH.
Answer:
B. That all organisms are related to one another
