recent studies in bone research indicate that using ultrasound on a broken bone can decrease the healng time by 25% which of these are the most basic levels of organization involved when a bone heals

This question is incomplete, it lacks options. The options are:

A. Cells and tissue

B. Cells and organ system

C. Organ system and organism

D. Tissue and organ system

The answer is A. Cells and tissue

Explanation:

A fractured/broken bone is capable of healing with time, although the process can be time-consuming. What occurs during the process is that blood clots develop around the area of the broken bone in order to protect the fracture and supply cells needed for the repair of the broken bone.

The aggregation of these cells form a tissue, which is the repair substance needed for the joining of the broken fragments. This repair substance is called CALLUS, which is initially made up of cartilage but later changes into bone tissue.

Hence, the most basic levels of organization involved when a bone heals are the CELLS and TISSUES.

the answer would be   10%