What characteristic about the tundra biome listed below does not contribute to a reduction of carbon dioxide on earth? a. nutrient-poor soil b. permafrost c. plants and their trapped carbon dioxide are frozen in the earth d. carbon dioxide sink

a. nutrient-poor soil

Tundra is the coldest biome on planet earth. It is located mainly in the Arctic region. Tundra biome functions as a sink of atmospheric carbon dioxide. This region undergoes rapid thawing and freezing. Usually, freezing occurs in the upper layers of soil and in deeper layers decomposition of dead plants and animals takes place. This facilitates the creation of organic matter source, which can be utilized by the plants for their growth under suitable conditions.  Nutrient-poor soil will not be able to decompose the dead remains, at desired rate. Therefore, will not be able to contribute to a reduction of carbon dioxide on Earth.

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.