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    By: Sunaina Jamil
    Date: Apr 20, 2015

    Hi, just wanted to ask what connects the rungs together?

    By: Lily
    Date: Apr 15, 2015

    Love it! Helped a lot!!! Thank you! (:

    By: Saresh cm
    Date: Nov 07, 2014

    Really amazing.

    By: cindy ramirez
    Date: Nov 06, 2014

    this dose not tell me what dna is when itas staite but dose give good info

    By: superstar
    Date: Oct 08, 2014

    it gave lots or information thanks