Algal blooms, and the rapid proliferation of photosynthetic plankton can ultimately end up depleting all the oxygen from a body of water.

Algal blooms can cause eutrophication: the algae eventually die, and decomposers use dissolved oxygen as they break them down. If oxygen is consumed faster than it is replenished, the water can become oxygen-depleted. So the statement is true, matching choice A, “T.”

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