If you are visiting with or talking on the phone with a friend who threatens immediate suicide, what should you do? a: reassure your friend that he or she has a lot to live forb: call 911 or take your friend to the emergency roomc: speak with your friend's parents or gaurdiansd: give your friend an emergency health hotline number

answer: proteins

explanation: complement is   system of circulate in the blood in a inactive form

i believe is what you're looking for?

                                                        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.