Use the following models to compare and contrast pure substances and mixtures. Pictures A and C are examples of mixtures.
Only picture D is a mixture.
Pictures D and C are examples of mixtures.
Only picture B is a mixture.

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides

that scientist would be robert hooke