How many cell divisions occur during mitosis

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false

Explain how negative feedback caused the changes in plasma glucagon concentration observed during the experiment.

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?