Which materials undergo radioactive decay? Check all that apply.
atoms that are unstable
elements that have a half-life
atoms that release energy and particles
elements that have turned into a new element
elements that have a consistent number of particles

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

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.