What are the most diverse ecosystems on earth?

a)tropical rainforests

b)coral reefs

c)fisheries

d)deep-sea areas

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.

cuz some people don't have enough food. that's why we need more ppl to donate food to the hungry.