Explain how the double helix structure of dna is like a spiral staircase.

The sugar-phosphate backbone is kind of like the spiral handrails of a spiral staircase, and the nitrogen-containing bases are like the steps that attach the railings to each other :)

the answer to your question is b

one is through turgidity. this occurs before ground tissue ( collenchyma

and sclerenchyma cells) become well

developed to give structural support to the plant as it grows bigger. the xylem

tissue (composed of rigid tissue) of the young

plant render this support and also maintaining osmotic turgidity of the surrounding

plant cells.