which of the following is not a factor in efficiency? a. metabolism b. type of movement c. muscle efficiency…

Brief Explanations:

Metabolism affects energy - use related to efficiency. Type of movement can influence how efficiently work is done. Muscle efficiency directly relates to overall efficiency. Digestion is mainly about breaking down food for nutrient - absorption and not a direct factor in efficiency in the context of movement or energy - use efficiency.

Answer:

D. digestion