Xander claims that since the model of the atom has been changed so many times, that means it is a weak model. Willow claims that the more a model has been examined and adjusted, the stronger it is. Who is correct and why? Xander is correct, because a model that has undergone many revisions is unreliable. Xander is correct, because a good model would never change. Willow is correct, because scientific models change over time. As new information is found, scientific models need to be adjusted. Willow is correct, a because scientific models do not actually have any meaning or provide useful evidence, so it does not matter how many times they change.