Base your answer to the following question on the information below and on your knowledge of biology. After the Aswan High Dam was built on the Nile River, the rate of parasitic blood-fluke infection doubled in the human population near the dam. As a result of building the dam, the flow of the Nile changed. This changed the habitat, which resulted in an increase in its population of a certain aquatic snail. The snails, which were infected, released larvae of the fluke. These larvae then infected humans. This situation best illustrates that (1) the influence of humans on a natural system is always negative in the long term (2) the influence of humans on a natural system can have unpredictable negative impacts (3) human alteration of an ecosystem does not need to be studied to avoid ecological disaster (4) human alteration of an ecosystem will cause pollution and loss of finite resources

Bravery can you to do something that is new, frightening, or dangerous. people may need bravery to speak out against injustice or persevere when a task is difficult. think about an event in your life that required bravery. write a personal narrative that recounts the event. describe what happened and the impact the event had on your life. as you write, remember your essay will be scored based on how well you: develop a multi-paragraph response to the assigned topic that clearly communicates the purpose of your story to the audience describe the characters, setting, and conflict using meaningful sensory descriptions and details that enable the reader to visualize the experiences in your narrative. organize your story in a clear and logical manner, including an introduction, body, and conclusion. use well-structured sentences and language that are appropriate for your audience. edit your work to conform to the conventions of standard american english. use any of the tools available to you, such as the checklist, spellchecker, or graphic organizer.