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Controlled Variables and Standardized Conditions
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ACT Prep
AS.048 Controlled Variables and Standardized Conditions
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Research Summary: Students test whether soil amendment type affects carbon dioxide release from soil jars. Which condition must be standardized?
A
Incubate jars until each reaches the same carbon dioxide concentration, when the stated controls and comparison conditions are applied.
B
Use the same soil mass, soil source, moisture level, amendment amount, jar volume, incubation temperature, and incubation time.
C
Add more amendment to the mineral treatment because it contains less carbon, under the conditions and evidence described in the passage.
D
Use wetter soil with compost because microbes need water, for the specific setup, variables, and limits stated in the item.
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