Question

Human Activity and Change Quick Check
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Question
What effect do algae blooms have on ocean ecosystems?(1 point)
Responses

increased fish population
increased fish population

increased underwater plant population
increased underwater plant population

decreased carbon dioxide in the water
decreased carbon dioxide in the water

decreased oxygen in the water
decreased oxygen in the water
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Answer 1

Algal blooms primarily lead to decreased oxygen in the water. This occurs because when algae die and decompose, the decomposition process consumes oxygen, resulting in hypoxic conditions that can be harmful or lethal to marine life. Therefore, the correct response is:

**decreased oxygen in the water**