Answer:
Tissues
Step-by-step explanation:
Tissues are made up of similar cells that perform the same function.
Bones are a specific component of the skeletal system and is mostly made of minerals. Hence, it is not a tissue.
Joints are descriptors of the linkage of bones that are not made of cells grouped together, serving the same function.
System is made up of many organs that are made up of many tissues that are made up of many cells grouped together to serve the same function.