Question

lake erie is home to a form of algae called \cyanobacteria.\ this species can produce the toxin microcystin, which poses a risk to human and wildlife health. the cells that produce this toxin sometimes float to the surface of water, while at other times they sink to the bottom. because water treatment intake structures are usually located below the surface, the risk of toxins in raw water may be greater when these cells sink. in the summer of 2020, despite an unusually large toxic bloom, water treatment facilities reported little to no instances of toxic water intake. this suggests that which choice most logically completes the text? a a toxic bloom did not occur that summer, despite scientists fears. b more cyanobacteria gathered near the bottom of the lake than at the surface that summer. c cyanobacteria generally floated at the surface of the water that summer instead of sinking to the bottom. d cyanobacteria produced significantly lower levels of microcystin that summer because of scientists protective measures.

Explanation:

The text states that despite an unusually large toxic bloom, water - treatment facilities reported little to no instances of toxic water intake in summer 2020. This implies that the feared toxic bloom did not occur as scientists worried.

Answer:

A. a toxic bloom did not occur that summer, despite scientists' fears.