This topic focuses on practicing the identification of explanatory and response variables in linear scatter plots. It includes various problems where learners are required to determine if a particular variable, such as temperature, sales, age, or seeds, acts as an explanatory or response variable based on the provided scatter plot graphs. Each question presents a scatter plot and asks the learner to classify one of the variables represented on the graph. This exercise is part of an introductory unit on data and graphs with emphasis on scatter plots.