This document outlines a unit plan for a science course on the science of breathing for grades 9-12. The unit will compare how plants and animals breathe through processes like photosynthesis and respiration. Students will identify breathing structures in plants and animals and the similar product of carbon dioxide produced by both. The unit will take approximately 6 weeks and involve group projects to research these topics using resources like textbooks, websites and possible field trips. Assessment will be based on a rubric and students will be expected to understand the differences and similarities between how plants and animals breathe.