Which of the following is a scientific observation about the bird pictured
below?

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

b a mature ovary of a plant.

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves