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mario62 [17]
2 years ago
4

Please I need help with question 17 and 18 and it’s very hard and I’m struggling with it and if you need to see the picture big

then click on it and it will be big

Biology
2 answers:
igomit [66]2 years ago
6 0
17. Carbon Dioxide.
18. Oxygen
ololo11 [35]2 years ago
4 0
17 is oxygen and 18 is carbon dioxide
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