Multiple choice

Biodegradable waste material can be made harmless by ___________.

  1. mixing them with chemicals

  2. the action of certain bacteria on them

  3. boiling them in water

  4. recycling them

  5. all of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Biodegradable waste material can be made harmless by the action of certain bacteria on them. Biodegradable waste can be decomposed by the action of bacteria on them,  and hence they do not remain in the same physical form that they were in, when they were chucked out.

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