Final answer:
The experiment where buntings flee from butterflies with eyespots demonstrates how a predator's response can influence prey's traits, affecting natural selection and leading to evolutionary changes within species.
Step-by-step explanation:
In the butterfly experiment, the variable(s) are the factors that are manipulated or measured to observe their effects. Based on the options provided: 3) butterfly wings pattern color and sounds emitted. This choice indicates that both the color of the butterfly wings and the sounds emitted by the butterflies are considered variables in the experiment. Variables are crucial components in scientific experiments as they help researchers understand the relationships between different factors and the outcomes of the study. While options 1, 2, 4, and 5 may be elements involved in the experiment, option 3 explicitly highlights the variables being studied—butterfly wings pattern color and sounds emitted.