A chemical known as a fertex affects external fertilization of sea urchin eggs. An experiment was set up using three tanks to investigate the effect of fertex. Each tank had a different concentration of fertex: 1%, 2%, and 3%. Ten sea urchin eggs and 2mL of sea urchin sperm were added to each of the three tanks. A fourth tank was set up as a control.
State one example of the type of data that should be collected during the experiment.
Identify the independent variable in the experiment.
State one way to improve the validity of the experimental results.
Identify two factors that must be kept the same in all four tanks.
State one way the contents of the control tank would differ from the contents of the three experimental tanks.
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