AP Environmental Scienceeasymcq1 pt
A dead zone forms when
A.decomposing algae consume the dissolved oxygen
B.water becomes too salty
C.fish eat all the algae
D.temperature drops to freezing
Explanation
Core Concept
Bloom die-off feeds oxygen-hungry bacteria; hypoxic water cannot support fish — the Gulf of Mexico's seasonal dead zone is the largest US example.
Correct Answer
Adecomposing algae consume the dissolved oxygen
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