Cells are combined in a structure called tissue wich have the same properties like the cells wich are formed by.
I think it is erosion (2) because erosion removes soil, rock, and dissolved material.
The answer is long
The bone indicated by the arrow is femur bone. It should be classified as the long bone. Other example for long bones would be tibia and fibula. Short bone would be carpal or tarsal bones. Flat bone could be found in skull. Irregular bone would be the vertebrae or pelvic.
