tailieunhanh - Delta's key to the next generation toefl test part 20

Jn the Reading section, students read three passages and answer questions about them. In the Listening section, students listen to two conversations and four lectures and answer questions about them. In the Speaking section, students speak in response to two questions about their own experience and four questions about texts that they listen to or read during the test. | Organizing Information Proximate and Ultimate Causation Behavioral biologists ask two basic types of questions about animal behavior how animals behave and why they behave as they do. The how questions seek to understand the proximate or immediate causes underlying a behavior at a particular time and place. For example a biologist might want to explain the singing of a male white-throated sparrow in the spring in terms of hormonal or neural mechanisms. Such physiological causes of behavior are proximate factors. Alternatively another biologist might ask what purpose singing serves the sparrow and then attempt to understand events in the evolution of birds that led to springtime singing. These are why questions that focus on ultimate causation the evolutionary origin and purpose of behavior. These two types of questions are very independent approaches to behavior. Questions about proximate causation examine how animals perform their various functions at the molecular cellular organismal and population levels. The biological sciences that address proximate causes are known as experimental sciences because they use the experimental method of 1 predicting how a system will respond to a disturbance 2 making the disturbance and 3 comparing the observed results with the predictions. Researchers repeat the experimental conditions many times to eliminate chance results that might lead to false conclusions. Questions about ultimate causation ask what produced biological systems and their distinctive properties through evolutionary time. The sciences dealing with ultimate causes are known as evolutionary sciences and they mainly use the comparative method rather than experimentation. Researchers compare characteristics of molecular biology cell biology anatomy development and ecology among related species to identify patterns of variation. 7. Which sentence below best expresses the essential information in the highlighted sentence in paragraph 1 Incorrect choices change