Which of the following is a term that describes any interaction between organisms of different species where at least one organism is affected? Select all that apply.
(1)commensal relationship
(2)mutualistic relationship
(3)parasitic relationship
(4)symbiotic relationship

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.

i wish i could with all of them i can barley see the first one so here's the answer to the first one b

i am sorry but i need more information and a picture.