State two ways in which light influences terrestrial organisms

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /

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 believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.