A researcher wants to determine if water runoff from farm fields sprayed with herbicides affects the hatching success of frog eggs in nearby ponds. What experiment could the researcher conduct to address her question?

1) Observation: "I've seen that frog eggs in ponds that receive runoff from farm fields sprayed with herbicides hatch at lower ratesthan those unaffected ponds."

2) Hypothesis: "The hatching success of frog eggs is affected by exposure to herbicides."

3) Prediction: "If frog eggs are exposed to elevated levels of herbicides the hatching success of the eggs will decrease."

4) Test: In the laboratory, raise frogs in pond water with varying concentrations of herbicide, and measure hatching successrates.

5) Result: Analysis of experiment data concludes that herbicide levels affect hatching rates.