Answer:
Basic research
Explanation:
Basic research is very basic research. This research is related to the research that we conducted to increase our knowledge. This research is purely based on theory. In this research, we increase our knowledge related to a specific phenomenon.
In this research, the problem of the behavior is not solved. It is an important assumption about basic research that it is theoretical and not necessary that it will be right away. In the initiation phase of a researcher does not know anything. But later on, learning about specific phenomena gather the information about the topic and does their further research.
In the above context, the researcher was doing basic research on mice and grasshopper. They don't have much knowledge about it. They learned theory and gather more information about this specific topic.