Muscles can be viewed as D. The body's engine.
What are muscles in the body?
Muscles can be described as those soft tissues that can be found in our body, And they are made up of different stretchy fibers, with over 600 muscles in our body.
The different types of muscles perform different functions, while Some muscles help us to run, jump, hence, they can be viewed the body's engine.
Therefore option D is correct.
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