Bài này làm sao vậy ??/

the sphincter muscles at the end of the digestive tract is the anus.

hope it mark me as brainlieast.

b ti isnfornopgnoernfrof

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