The best explanation for the change in the bugs after the introduction of invasive plants is that bugs with longer mouthparts have a survival advantage.
What is natural selection?
Natural selection is the process by which individuals of a population that are better suited to their environment are more likely to survive and reproduce.
According to this question, a population of bugs have experienced an increment in the following features:
- average length of mouthparts
- average body length
This suggests that the bugs have become more adapted since the introduction of the invasive plants to enable them survive, hence, they developed longer mouthparts and body length.
Learn more about natural selection at: https://brainly.com/question/9830102