Which description best explains watson and crick's dna model? . a: dna single stranded molecule that has nitrogenus base towards its exterior . b: dna is a double-helix made of 2 strands linked together with hydrogen bonds . c: dna is a double-helix that contains nitrogenious bases towards its exterior

B:DNA is a double-helix made of 2 strands linked together with hydrogen bonds.

Explanation:

According to the double stranded structure of the DNA proposed by Watson and Crick. The DNA double helix consists of sugar-phosphate backbones that lies outside, the DNA double helix in between is supported by the hydrogen bonds present in between the pairs of nitrogenous bases on the inner side.          

volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).

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