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Single-celled microorganisms that cause diseases are known as:

  1. Fungi

  2. Pathogenic bacteria

  3. Viruses

  4. Yeast

The correct answer is: Pathogenic bacteria

Option A,Fungi, are NOT single-celled organisms. Option C, Viruses, are NOT technically considered living organisms and thus cannot be classified as "single-celled microorganisms." Option D, Yeast, are typically not pathogenic and are used in many food production processes. Option B, Pathogenic bacteria, are single-celled microorganisms that can cause disease in humans, animals, and plants, making it the correct answer.