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Identify Limiting Factors and Predict Impacts
Worksheet
Grade Level
Grade 8
8.100 Identify Limiting Factors and Predict Impacts
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Which investigation best tests whether phosphorus limits algae growth in pond water?
A
Measure algae once in one pond without changing anything.
B
Add phosphorus to some identical pond-water samples, keep others as controls, and compare algae growth.
C
Add fish to every sample and ignore nutrient levels.
D
Change light, temperature, and phosphorus all at the same time in every sample.
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