to elliminate soures of error
You need a control group so that you can compare what happens in the control group with what happens in the experimental group. The control group is the standard of comparison. Without it, you can't know what effect, if any, the fertilizer had on the experimental group of plants.
to have something to compare with the growth of fertilized plants
to increase replication in the experiment
to elliminate soures of error
Nitrate
That elements found in soil fertilizer are nitrogen, phosphorus, and potassium.
Nitrogen.
neutrons
Why must controls (such as plants given water only) be used in the fertilizer experiment
to have something to compare with the growth of fertilized plants.
to have something to compare with the growth of fertilized plants
to elliminate soures of error
to elliminate soures of error
to elliminate soures of error
to have something to compare with the growth of fertilized plants. (; britnee Morgan
to have something to compare with the growth of fertilized plants. (; britnee Morgan
to elliminate soures of error
to elliminate soures of error
to have something to compare with the growth of fertilized plants. (; britnee Morgan
to have something to compare with the growth of fertilized plants. (; britnee Morgan