22. To test whether a plant grows better in acidic or basic soil, the amount of water and sunlight the plants receive must be controlled as
factors called what?

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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).

the correct answer is:

a population changes in response to a change in the environment.