The atmospheric layer responsible for weather is the
troposphere
stratosphere
mesosphere
thermosphere

The troposphere is the first layer above the surface and contains half of the Earth's atmosphere. Weather occurs in this layer.

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.

maritime tropical may be your answer.