Ple 1.) what is a function of carbon dioxide ( co2) in the body? a.) regulate the ph of blood b.) adds structure to hair c.) energy source d.) energy storage 2.) what is sodium chloride (nacl)? a.) a protein b.) a carbohydrate c.) an ionic compound d.) a covalent compound 3.) which type of substance is protein? a.) a small molecule b.) a large molecule c.) an ionic compound d.) an ion 4.) which type of substance is calcium phosphate (ca3(po4)2)? a.) it is a small molecule b.) it is a large molecule c.) it is an ionic compound d.) it is an ion 5.) which small molecule makes up about 70 percent of cells? a.) dna b.) fat c.) oxygen d.) water 6.) which of these large molecules are important for energy storage? a.) dna and lipids b.) dna and rna c.) lipids and starches d.) rna and starches