What do we call the area of Earth, from the top of the highest mountain
to the bottom of the ocean, in which
all life exists?
A. atmosphere
B. life bubble
C. biosphere

i think that the best answer would be c.

tell me if im wrong : )

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.

it's false. hope i .