What was Anton van Leeuwenhoeks contribution of cell theory?

What are levels of ecology and how can we remember them

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?

One drawback of dams is that they can flood land upstream from the dam and reduce water flow downstream from the dam. a. true b. false