I would say C because our body is continuously changing through puberty. We need more sleep, more food consumption, we need to have fantastic hygiene, etc...
I think it is erosion (2) because erosion removes soil, rock, and dissolved material.
It is called Fluid Mosaic Model. It describes the structure of the plasma membrane as a mosaic component. The structures such as phospholipids, protein, carbohydrates and cholesterol gives the fluid like character of the plasma membrane.
This statement giving a clue that there is asexually reproduction (may be binary fission) taking place and the progenies in asexual reproduction are genetically similar to parent cell. So answer is A.
