Questions: This system provides the force to move bones about their joints. nervous muscular skeletal endocrine

The answer is the second one (muscular): This system provides the force to move bones about their joints.

Explanation for each option:

1. Nervous: The nervous system is responsible for transmitting signals between different parts of the body. It controls and coordinates actions and reactions, but it does not provide the force to move bones.
2. Muscular: The muscular system is responsible for generating the force needed to move bones about their joints. Muscles contract and pull on bones, creating movement.
3. Skeletal: The skeletal system provides the structural framework for the body and supports and protects organs. It also provides attachment points for muscles but does not generate the force for movement.
4. Endocrine: The endocrine system consists of glands that release hormones into the bloodstream to regulate various body functions. It does not provide the force to move bones.

Summary: The muscular system is the correct answer because it generates the force required to move bones about their joints.