Multiple choice

Red tide is caused by

  1. protozoans

  2. corals

  3. dinoflagellates

  4. All of the above
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Red tide is caused by dinoflagellates (like Karenia brevis), which are microscopic algae that can reproduce rapidly and produce harmful toxins that color the water red. They are neither protozoans, corals, nor all of the above.

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