To raise an arm upward, the muscle on one side of it contracts. what happens to the muscle on the opposite side of the arm? a. contracts b. relaxes c. both contracts and relaxes d. neither contracts nor relaxes

c

explanation:

i think

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