Carved Stone Balls Analysis

First, the author believes that the carved stone balls could be utilized as weapons in hunting and fighting. While, the professor find this idea unconvincing and states that the common arrow-shaped weapons which were used in past all have some signs which indicate them as a weapon. She also states that If those ball stone were used as a weapon they should be cracked, but the evidences indicate that they are very well preserved. So this theory is unlikely to be