Multiple choice

Which of the following ecosystems is natural?

  1. Crop field

  2. River

  3. Aquarium

  4. Park
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Natural ecosystems form without human intervention. Rivers are naturally occurring systems with flowing water, plants, animals, and microorganisms interacting. Crop fields, aquariums, and parks are all human-made or maintained.

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