Reading the entire DNA sequence of the piece to be cut and spliced is not critical in creating Bt corn; rather, using restriction enzymes and DNA ligase to splice and stitch DNA are the vital steps. ;
The step that is not critical in the creation of Bt corn is reading the entire DNA sequence of the piece to be cut and spliced. It is important to understand specific sequences for targeting but not necessary to read the whole sequence for the process. Therefore, the correct answer is D.
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