Multiple choice

Biological communities change because

  1. new species move in, displacing the old ones

  2. the soil is depleted and all the food gets finished

  3. old species evolve into new species

  4. each stage modifies the environment and adapts for a later stage
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Biological communities change because each stage modifies the environment and adapts for a later stage. This change is due to growing acceptance for the idea that all of life is interconnected and that the living world is tied to the non-living or inorganic world. 

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