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Life Science Chapter Two: What are the Interactions in Ecosystems? Multiple Choice Lesson One: Ecosystems 1. What are some examples of nonliving parts of an ecosystem? 2. One year, an ecosystem receives only a small amount of its usual rainfall. What will most likely happen because of the lack of rain? 3. What is an example of two species interacting in an ecosystem? 4. What are some examples of living parts of an ecosystem? Lesson Two: Predation and Competition 1. What is an organism’s niche? 2. Which of these is a way that competition helps ecosystems? 3. Look at the picture of a watering hole. How does this picture show competition? Lesson Three: Living Together 1. What is an example of symbiosis? 2. What are the benefits of the symbiotic relationship between the bullhorn acacia tree and acacia ants? 3. In the symbiotic relationship between the mistletoe plant and its host tree, how does mistletoe damage its host? 4. What is the symbiotic relationship between a shark and a remora? Lesson Four: Changing Communities 1. Over time a pond becomes a marsh. The land gradually dries, and the marsh becomes a meadow. What is this transition from one ecosystem to another called? 2. What is the first change to occur as an ecosystem recovers from fire? 3. When a beaver builds a dam and cuts off a stream, a pond is formed. The pond begins to change almost as soon as it is formed. What is the first change to take place? 4. How do invasive species, like zebra muscles affect an ecosystem? Lesson Four: Changing Communities 1. What human actions pollute the air in an ecosystem the most? 2. What are some ways humans can help the environment? Short Answer Hyenas and lions are part of the community of animals in the African savanna. Because food can be scarce in the savanna, hyenas and lions often compete for food. What will most likely happen to the hyena and lion population if they are competing for the same resources? How might the need to compete for resources be good for the hyena and lion?