What is the variable that affects enzyme function in the example of catalase?

5a, a student set up test tubes containing solutions of different pHs, and used a sensor to measure changes in oxygen gas pressure during the reaction of hydrogen peroxide by the enzyme catalase. In this example, the independent variable is pH and the dependent variable is gas pressure

Explanation:

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volcanoes (an event in the geosphere) release a large amount of particulate matter into the atmosphere. these particles serve as nuclei for the formation of water droplets (hydrosphere). rainfall (hydrosphere) often increases following an eruption, stimulating plant growth (biosphere).