Where does the sugar molecule used to begin cellular aerobic respiration come from DIRECTLY for us humans?

What's the waste product of electrons and pyruvate combining in fermentation?  

If the rna molecule in a human has the nucleotide sequence of guu, this would the amino acid valine would be needed to make the protein. how would this cha process was occurring in a mushroom?

When sodium chloride dissolves in water, the sodium chloride dissociates into a. na- ions. b. cl+ ions. c. nacl ions. d. sodium chloride ions.