A practice of TOEFL integrated writing (TPO43), any help will be appreciated :) ! ** question & materials link: http://toefl.kmf.com/question/859a2d2be6d5405a00d48db6526756e0/868sok.html ** any tip for writing faster? I am so frustrated about exceeding the time limit :( Both the passage and the lecturer discuss several theories of how agnostids, a group of extinct marine arthropods, lived 450 million years ago. The author of the passage describes three of the possible theories, while the lecturer, in contrast, holds an opposite opinion. In her opinion, each of the theories has a serious weakness. Firstly, the passage points out that agnostids might be free-swimming predators, feeding on smaller organisms in the ocean. Nevertheless, the lecturer challenges this theory by noting that, agnostids lacked a critical characteristic of predators, well-developed eyes. In addition, evidence of other specialized sensory organs were not found in the fossil. Secondly, the passage states that agnostids were probably seafloor dwellers, just as other primitive arthropods. The lecturer rebuts this theory as well. She suggests that seafloor dwellers typically don't move very fast or very far, and stay in a localized area. However, agnostids had mutiple habitats that are far from each other, which means they had the ability to move to a distanced area very fast. Finally, the passage claims that agnostids were possibly parasites, since many other modern arthropods, such as fleas or ticks, exist as parasites. The lecturer, on the other hand, posits that the population of agnostids was very large, which is unusual to parasites. Based on the lecture, large amount of parasites might kill all of their hosts, and they could become extinct along with the hosts.