Fourth grade respiration

In the Respiration Module students are given bottles with blue solution in which they can change the contents and conditions of the bottles. When the bottles sit for 24 hours, some of the bottles change color from blue to yellow. Students explore what makes the bottles change color. Students explore variables such as aquatic animal type, plant type, and light amount. The result of their findings shows that the presence of CO₂ is the cause of the color change. They use this to learn about respiration in plants and animals as well as photosynthesis. In addition they explore how CO₂ levels are changing in the environment. (4-LS1-1).