What effect do algae blooms have on ocean ecosystems?
A. Increased fish population
B. Decreased oxygen in the water
C. Increased underwater plant population
D. Decreased carbon dioxide in the water
B. Decreased oxygen in the water
Algae blooms can lead to decreased oxygen levels in the water as the algae consume oxygen during their growth and decomposition process. This can result in hypoxic or anoxic conditions, harming marine life by causing fish kills and disrupting the balance of the ecosystem.