easy · Enhanced ACT science
A gardener compares the growth of rose bushes using three different types of mulch: Wood chips, Rubber pellets, and Pine needles. She measures the soil moisture daily for 30 days.
What is the isolated variable in this experiment?
- The 30-day testing period.
- The moisture level of the soil.
- The amount of sunlight received.
- The material used as mulch.
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