CTET 2 Math and Science 20 Aug 2023 Paper

After teaching the chapter Respiration in Organisms' in Class VII, a teacher performs the following activity with her students. They take three test tubes and fill 3/4th of each with water. The test tubes are labeled A, B, and C. They put a snail in test tube A, a water plant in test tube B, and in C they kept the snail and plant. The teacher then asks the students which test tube would have the highest concentration of CO₂. Which process skill is the teacher emphasizing in this case?