Look at the slide from an oral presentation about fossils. a slide that reads, "fossils: how they us understand the past." there is a photo of a fossil. what should be added to this slide to make it more effective? an audio track an instructions list the speaker’s notes a caption

American scientist, linus pauling, was one of many scientists racing to discover the molecular structure of dna. pauling initially thought that the molecule was a triple helix. later, james watson and francis crick unveiled their double helix model, which turned out to be an accurate description of the molecule's shape. why did watson and crick succeed when pauling failed?