i think it's c. molecular
The rock layer on the bottom will decompose and either turn to sand, gravel, or blend in with the dirt (but most likely not the last one).
In evolutionary theory, adaptation is the biological mechanism by which organisms adjust to new environments
Answer:
The answer is A.
Explanation:
The correct order for the bone cells from unspecialized stem cell to highly specialized mature cells is Osteoprogenitor Cells, Osteoblasts and Osteocytes so the correct answer is A.