How is bacteria helpful?
A. Provide carbon dioxide, food products, environmental recycling, medicine.
B. Provide oxygen, food products, environmental recycling, medicine.
C. Provide oxygen, food wastes, environmental recycling, medicine.
D. Provide oxygen, food products, environment medicine.
Select your answer:
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Which of the following is far-sightedness?
D. All of the above
Pollution › View
This picture shows people walking through a highly-polluted city in China. From what type of pollution are they protecting themselves based on what they are wearing?
A. air pollution
B. water pollution
C. land pollution
D. noise pollution