Prior to the 1970s, scientists believed that new neurons could not be generated in adult brains. in the 1970s, dr. goldman and dr. nottbohm discovered that hormones injected in adult songbirds could cause female songbirds to develop new neurons. which statement best exemplifies the scientific principal that occurred in this case? new experiments do not affect science because science remains constant. new experiments can affect future scientific explanations. new experiments can affect previous scientific explanations. new experiments yield untrustworthy data and should be carefully considered.