Cyanobacteria threaten humans and wildlife. But these algal blooms may also have a good side. Which two details from the text show this?
A. Slimy green algae can easily take over a lake.
B. These tiny life forms made Earth’s first breathable air.
C. Huge algal blooms fertilized by iron pull greenhouse gases out of the atmosphere.
D. They feed on nitrogen and not phosphorous.
E. Scientists think didymo has been there all along in its harmless state.
Cyanobacteria threaten humans and wildlife. But these algal blooms may also have a good side. Which two details from the text show this?
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The correct answers are: B and C.
Explanation:
– B: “These tiny life forms made Earth’s first breathable air.” This detail highlights a beneficial aspect of cyanobacteria, showing their crucial role in the planet’s history and the development of an atmosphere that supports life.
– C: “Huge algal blooms fertilized by iron pull greenhouse gases out of the atmosphere.” This detail indicates that while algal blooms can be harmful, they might also have a positive environmental impact by helping to reduce greenhouse gases, illustrating a potentially beneficial side of these blooms.
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