Biology

The correct answer is: C.Nutrients increase in the water.

Algal blooms typically occur when there is an increase in nutrients, particularly nitrogen and phosphorus, in the water. These nutrients often come from sources such as agricultural runoff, wastewater discharge, and industrial pollution. When these nutrients become abundant, they fuel the rapid growth of algae, leading to an algal bloom.

Why the other options are incorrect:

A.Toxins accumulate in shellfish: While certain types of harmful algae can produce toxins that accumulate in shellfish (...