The photograph shows a glue gun. This tool heats a solid stick of glue until it becomes a liquid
Which physical change is shown in the photograph?
O A. Crystallizing
OB. Melting
O C. Dissolving
O D. Condensing

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