Multiple choice

Which of the following ecosystems covers the largest area of Earth’s surface?

  1. Marine ecosystem

  2. Desert ecosystem

  3. Mountain ecosystem

  4. None of these
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A Correct answer
Explanation

Marine ecosystems cover about 71% of Earth's surface, making them the largest ecosystem by area. This includes all oceans and seas, which far exceed the total area of all terrestrial ecosystems combined - deserts cover about 33%, mountains about 25%, and other land ecosystems the remainder.

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