H2O is classified as a chemical compound.
The answer cannot be b, because that would be volume. It also cannot be c because that would be mass, which leaves the answer to be a, the amount of matter that makes an object.
This happens due to geologic uplift and the erosion of the rock and soil above them. At the surface, metamorphic rocks will be exposed to weathering processes and may break down into sediment. These sediments could then be compressed to form sedimentary rocks, which would start the entire cycle anew.
Answer:
Pioneer species begin in barren areas, such as on bare rock exposed by a retreating glacier.
Explanation:
It is the amount and types of bugs affect how many birds there are and what birds evolve.