tpo 43 how agnostids lived and they behaved

The material discusses how agnostids ate and how they behaved. While the reading suggests three theories about that, the listening challenges this and claims that each one of these three theories has a serious weakness. First, the author states that since agnostids were a type of primitive arthropods, they might be free-swimming predators. On the other hand, the professor opposes this and points out that swimming arthropods have the ability to catch prey, given that they have large and well-developed eyes. The lecturer adds that agnostids had poorly developed eyes even some of them were completely blind. according to the lecture, if agnostids were free-swimming predators, they should have other sensor organs that helped them be to catch their food. The speaker says that there is no evidence about sensor organs in their fossils. Thus, that rolled out this hypothesis. Second, the writer states that agnostids were seafloor dwellers like many types of primitive arthropods. On the contrary, the lecturer encounters this and brings up that seafloor dwellers could not move fast, so they stay in a localized area and occupy a small geographic area. Nevertheless, agnostids inhabited large geographic areas, and there were large distances between these areas. The speaker concludes that agnostids could move very fast to occupy all these areas, so they could not be seafloor dwellers. Third, the reading cites that agnostids might be parasites like many modern arthropods. Conversely, the professor contradicts this and contends that the parasites population could not be large and should stay within a certain limit, so they could not kill off the host. However, the lecturer states that the agnostids population was large because they found a vast amount of fossils of individuals. Hence, that rolled out this theory.