Answer:
1.
Independent: the concentration of carbon dioxide
Dependent: the rate of photosynthesis
2.
Independent: the type of alcohol
Dependent: the damage to the membrane
Explanation:
Independent variable - the one thing YOU can change (which in the examples was the carbon dioxide concentration and the type of alcohol)
Dependent variable - what changes because of the independent variable (which in this case was the rate of photosynthesis and the damage to the membrane)
Hope this helped but probably not :)
