Which of the following is an adaptation that to defend an organism against consumers? a. a rose has thorns. b. a bird has a strong beak to break nuts. c. a plant bends toward sunlight. d. all of these

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?