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Why is it important to have cartilage in movable joints? It builds new bone as the bones wear down. It keeps the bones from rubbing together. It holds the bones of the joint together. It connects the bones to surrounding muscle

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B. It keeps the bones from rubbing together. If the cartilage wasn't there, the bones might try to fuse. With some people, the absence of the cartilage would result in arthritis. 

Answer: It keeps the bone from rubbing together.

Explanation:

Cartilage is a soft connective tissue.

The cartilage is present in the joints between the bones. Cartilage allows the bones to glide over each other but also prevent the bones from rubbing against the contacting region. This prevents the condition of osteoarthritis.