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.