The author compares the wings, tails, and crests of different pterosaurs. Why does the author make these comparisons?

the dna molecules have a negative charge because of the phosphate groups in their sugar-phosphate backbone, so they start moving through the matrix of the gel towards the positive pole. power is turned on and dna fragments migrate through gel (towards the positive electrode).

explanation:

her next move would be to use agarose gel electrophoresis to separate the dna molecules of varying length and create a dna fingerprint.

they use sunlight, water, and carbon dioxide to make sugars - c.