The article states that fossil information does not allow paleontologists to determine with certainly what agnostide ate and how they behaved. therefore the author provides three theories about how agnostids may have lived. However, the professor explains that all theories had essential weakness and refutes each of the author's theories. First, the reading claims that the agnostids may have been free-swimming predators which hunted smaller animals. The professor refutes this point by saying that predator need smart eyes. He explains that smart eyes is one of the prominent factors that any predator need but agnostids did not have it. they usually used other sensor organ to track the preys. Second, the article posits that they may have
