Bone and cartilage are types of connective tissues in the body. A bone is hard tissue that forms the skeletal structure of the body. Cartilage, by comparison, is not as hard and rigid as bone, and is present in areas of the body like the ear, nose, and joints.
A waiver is the voluntary relinquishment or surrender of some known right or privilege. Regulatory agencies or governments may issue waivers to exempt companies from certain regulations. For example, a United States law restricted the size of banks, but when banks exceeded these sizes, they obtained waivers.
Generally not- as mentioned, the waiver needs to occur in a way that indicates a voluntary, intentional decision. The waiver can be accomplished either by a positive act or by an omission (a failure to do something). However, mere silence on a matter is generally not enough to constitute a waiver of contract.