More cards in this set

Card 26

Front

HOW CAN WE DECREASE THE PROBLEMS OF C02

Back

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Card 27

Front

NATURAL REMOVALS OF CO2

Back

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Card 28

Front

TESTING FOR OXYGEN

Back

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Card 29

Front

TESTING FOR CARBON DIOXIDE

Back

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Card 30

Front

TESTING FOR HYDROGEN

Back

Preview of the front of card 30