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Read the case study that is attached. Determine whether the algae growth was caused by human activities or natural events. Choose your challenge level (1, 2, or 3), and follow the format provided in the document.

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I think the algae growth was caused by natural events because---

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I think the algae growth was caused by humans because from the text it says " they found high levels of nitrates and phosphates, nutrients that often come from fertilizers and animal waste."

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I think the algae growth was caused by human pollution because in the text it said it was behind a neighborhood park, meaning that some people probably went over there and polluted the water.

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Level 1: I think the algae growth was caused by human activities. I say that because the background reading says "When scientists tested the water, they found high levels of nitrates and phosphates, nutrients that often come from fertilizers and animal waste." which was caused by human activities.

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I think the algae growth was caused by "human activities because

in the story it saids  the data showed that fertilizer runoff from nearby lawns was washed into the pond every time it rained. The pollution wasn’t coming from a single source, but from many small areas across the neighborhood."

"When scientists tested the water, they found high levels of nitrates and phosphates, nutrients that often come from fertilizers and animal waste. They also found low dissolved oxygen and few bioindicators that could survive in clean water, like mayfly larvae."

and also in the last sentence in the story it saids "Scientists called this non-point source pollution." and non point source pollution is often caused by human excess fertilizers and pesticides from agriculture and suburban yards

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I think the algae growth was from human pollution. I think this because in the article it said "But soon, the fish began to die, and the water started to smell." which the smell already shows it could be human waste. The next thing was that the article said " nutrients that often come from fertilizers and animal waste." and that sentence shows direct evidence on what could have caused the growth in algae. My finale peice of evidence is in the text where it said "When the algae die, decomposers use up oxygen in the water to break them down. This leaves less oxygen for fish and other aquatic life." to which that gives the reason on why the fish had died. But it all led back to human pollution.

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The algae growth was caused by human activities. the text says high levels of nitrates and phosphates, which often come from fertilizers and animal waste, were found in the water

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I think the algae growth was caused by human impact, because the text mentions that runoff from the lawns in the neighborhood contained harmful fertilizers.

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I think algae growth was caused by human pollution and life cycle because the sentence said "When scientist tested the water, they found high rates of nitrate and phosphates, nutrients that often come fromferillizers and animal waste" I think that was caused by humans.

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I think the algae growth was caused by human activities, not natural events. And this is because scientists had found high levels of nitrates and phosphates in the water, along with fertilizer runoff from nearby lawns, meaning the pollution wasn't coming from a single source, but from many small areas across the neighborhood.

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The algae growth was caused by the humans pollution. I bevileve this is true because of this information from the text  When scientists tested the water, they found high levels of nitrates and phosphates, nutrients that often come from fertilizers and animal waste. In this case, the data showed that fertilizer runoff from nearby lawns was washed into the pond every time it rained. So humans made the pound this way.

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I think algae growth was caused by humans because from the text it says,, they found high levels of nitrates and phosphates,nutrients that often come from fertilizers and animal waste