Ontario Grade 9 Science Class Practice Exam

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What organisms are responsible for decomposing matter into nutrients?

  1. Plants and animals

  2. Bacteria and fungi

  3. Insects

  4. Mammals

The correct answer is: Bacteria and fungi

Bacteria and fungi are the two main types of decomposers in an ecosystem. Plants and animals may contribute to decomposition by breaking down matter through grazing or trampling, but they are not primarily responsible for this process. Insects and mammals also play roles in decomposition, but they are not the primary decomposers like bacteria and fungi are.

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