Answer and explanation

Correct answer: D. They break down dead material and return nutrients

  1. Step 1: Decomposers such as fungi and bacteria feed on dead matter.
  2. Step 2: This recycles nutrients.
Answer
They break down dead material and return nutrients.
Why not the others: They make food by photosynthesis using light: this is producers. They hunt other animals for food: this is predators. They fix nitrogen from air in the atmosphere: this is nitrogen-fixing bacteria.

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