When two movable joints meet at a joint, their do not touch one another.

The right answer is articular cartilages (bones in general).

A joint, in anatomy, is a junction area between two bone ends, or between a bone and a tooth. A joint is more or less mobile according to its constitution, its form, and the nature of the surrounding elements. Arthrology, or syndesmology, is the part of the anatomy that deals with joints.

Joint cartilage is the connective tissue that covers the friction surfaces of joints. "The articular surface of moving bones is covered with a layer of cartilage that facilitates movement while cushioning shocks.

i believe it is the last one. im sorry if im wrong!

                                                        water

a colorless, transparent, odorless, tasteless liquid that forms the seas, lakes, rivers, and rain and is the basis of the fluids of living organisms.

                                                        halon  

any of a number of unreactive gaseous compounds of carbon with bromine and other halogens, used in fire extinguishers, but now known to damage the ozone layer.

                                                  dry chemical

extinguishing agent used on class a, class b, and class c fires.

                                                  carbon dioxide

a colorless, odorless gas produced by burning carbon and organic compounds and by respiration. it is naturally present in air (about 0.03 percent) and is absorbed by plants in photosynthesis.