Asked by Andrea

determing whether expired air contains CO2.
1.Formulate hypothesis
2.Aim
3. a) idependent V, dependent and controlled variables
4. methods step by step
5. observation

Answered by PsyDAG
What is your question?
Answered by DrBob222
I think Andrea wants us to do her assignment.
Answered by Dudu
1,2,3
Answered by Emmanuella
To demonstrate that exhaled air contains carbondioxide
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