The lesson can be modified and different materials used to show how paper has been made throughout history. You can even use the lesson as part of a unit on community service and make special papers for cards for a local nursing home or other facility. All Breathe Deep - Students see plant respiration at work and learn how humans and trees interact to provide clean air for both. This activity allows younger children to see how plants produce oxygen for us. The lesson can be extended into language arts classes to write about explaining a process.
Science classes can use the lesson as a way to introduce interdependent relationships.
For higher grades the lesson can be used to measure volume of water displaced by oxygen over time. This answer can be integrated into a math activity on estimating the amount of oxygen produced by a single tree. You Didn't Know . . . The activity could be extended into the community to have students learn which types of products are made in their community. Older students could use the same lesson and extend it into a social studies lesson on the impact of wood manufacturing on the local economy, including how many people are employed locally, what they produce and the effects on the local economy and resource of both more and less production.