Cyanobacteria are photosynthetic single-celled organisms that thrive on the sunlight and nutrients. Cyanobacteria blooms (blue-green algae) are a frequent occurrence in the Great Lakes, particularly in Lake Erie, Green Bay, and Saginaw Bay in August and early September. Which statement(s) describes the main cause(s) of the cyanobacteria blooms in the Great Lakes?

I. Humans activities are releasing chemicals like fire retardants and polybrominated diphenyl ethers (PBDE) into the lakes.
II. The nutrient levels of the Great Lakes are higher due to increased pollution.
III. Low oxygen levels in the lakes attract cyanobacteria.

Question

Cyanobacteria are photosynthetic single-celled organisms that thrive on the sunlight and nutrients. Cyanobacteria blooms (blue-green algae) are a frequent occurrence in the Great Lakes, particularly in Lake Erie, Green Bay, and Saginaw Bay in August and early September. Which statement(s) describes the main cause(s) of the cyanobacteria blooms in the Great Lakes?

I. Humans activities are releasing chemicals like fire retardants and polybrominated diphenyl ethers (PBDE) into the lakes.
II. The nutrient levels of the Great Lakes are higher due to increased pollution.
III. Low oxygen levels in the lakes attract cyanobacteria.

Vocaloid · Answer

answer choices:

A. I only
B. II only
C. I and II
D. II and III