What is it called when two bones separate at a joint

Also called a synovial joint. Two bones are separated by a space called a joint cavity. ... A classification of joint by its movement; a slightly moveable joint. Also called a cartilaginous joint, two bones are linked by cartilage.

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it is the background information on the characters and setting explained at the beginning of the story. the exposition will often have information about events that happened before the story began. the exposition is often the very first part of the plot.

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-lavira : )