Final answer:
Biomechanical efficiency refers to the ability to perform mechanical tasks with the least energy expenditure. Observations can identify improvements in biomechanical efficiency, such as designs of prostheses and fit between technology and humans.
Step-by-step explanation:
Biomechanical efficiency refers to the ability of an individual or a system to perform mechanical tasks with the least amount of energy expenditure. It often involves studying the movement and forces applied to the human body. In a scientific study, observations can be made to identify improvements in biomechanical efficiency.
For example, researchers can observe how different designs of prostheses allow recipients to engage in a wider range of activities. They can also study the effects of modifications in the fit between technology and the human using it, which is known as ergonomics.