The first set of images show two plots of land labeled Location A and Location B. The text accompanying the images is as follows: Observing and asking questions: Researchers observed that marsh grass grows taller in some places than others. This observation led to a question. Why do marsh grasses grow to different heights in different places? The second set of images are captioned 'Inferring and hypothesizing' and the text that accompanies the images is as follows: The researchers inferred that something limits grass growth in some places. It could be any environmental factor – temperature, sunlight, water, or nutrients. Based on their knowledge of salt marshes, they proposed a hypothesis: Marsh grass is limited by available nitrogen.