Read this sentence from the passage. Drought is caused by weather pattems, but is worsened by human activities. Highlight the two most likely reasons the author included the sentence in the passage. Answer choices for the above question 1. to explain the recent surge in China's attention to ecology 2. to descrībe the cause of food shortages in areas of China 3. to establish that industries are responsible for the condition of the Yellow River 4. to establish that the condition of the Yellow River is connected to farming practices 5. to substantiate the formation of the Loess Plateau Watershed Rehabilitation Project​