Ineed this asap! for the location and geologic periods represented by these rock layers, the most drastic and sudden change in life forms occurred at the end of the geologic period. a. carboniferous b. devonian c. cambrian d. silurian

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation:

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