An experimental design included references from prior experiments, materials and equipment, and
step-by-step procedures. What else should be
included before the experiment can be started?
(1) a set of data
(2) a conclusion based on data
(3) safety precautions to be used
(4) an inference based on results cell

                                                        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.

im sure he will be? ?