Multiple choice

Which of the following is not a beneficial organism?

  1. phytoplankton that releases oxygen

  2. mold that produces penicillin

  3. bacteria that grows on raw chicken

  4. bacteria in our digestive system
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Bacteria growing on raw chicken (such as Salmonella or Campylobacter) are harmful pathogens that can cause severe food poisoning. In contrast, gut bacteria, oxygen-producing phytoplankton, and penicillin-producing mold provide significant benefits to humans and ecosystems.

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