Final answer:
The student is describing an environmental science study within the field of biology, focusing on the environmental impact of different grocery bags.
Step-by-step explanation:
The high school science student is describing an environmental science study, which is a field of study within biology that analyzes the impact of human activities on the environment. In the study referenced, the student likely used a scientific method to conduct research and collect data on the environmental impact of different types of grocery bags. This could involve life cycle assessments, measuring carbon footprints, and considering factors such as materials, production, usage, and disposal processes associated with each type of bag.