The primary job of muscles is to provide movement to the animals. Thus, the correct option is A.
Muscles may be defined as the special and differentiated body parts that are responsible for the movement or locomotion in animals.
The main function of the muscle is to deliver the action of movement or migration to the animals. The process of digestion is performed by the digestive system.
Therefore, the primary job of muscles is to provide movement to the animals. Thus, the correct option is A.
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