In order for most chemical reactions to occur in living things what inorganic substance must be present?

Which would be the most useful source of evidence to support mcneill's contention?

Which organelle breaks down sugar molecules that supply energy to the cell ?

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids