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Which of the following situations results from an algal bloom in an ecosystem? A. increased biodiversity B. increased health issues for people, such as allergic reactions C. decreased water temperatures D. decreased phosphorus in the water supply

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Whenever there’s an algal bloom in an ecosystem, there’s also an increased health issues for people, such as allergic reactions (option B). Algae-causing blooms are potential sources of toxins that make people sick or are considered fatal for animals. It is even considered a toxicant for the community's water supply. 
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Answer:

B. increased health issues for people, such as allergic reactions

Explanation:

When an algal blooming occurs what happens is that in a body of water some algae starts to reproduce largely and starts to little by little decreasing the life on that given body of water, the oxygen, light and nutrients available for the living creatures starts to decrease and the corpses of those animals and plants start to decompose and create a great environment for bacteria and algae to reproduce, creating a toxic environment in that body of water and it wouldn´t be drinkable or extremely toxic to human consumption.

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