- What are the most essential Rx to Human life?
- Trees and living organisms created trees and plants and that has created oxygen that is essential for humans because they need to breath.
- What are the most essential Rx to Animal/plant life?
-- Chemical changes 1. Plants apply a chemical reaction called photosynthesis to convert carbon dioxide and water into food (glucose) and oxygen. It's one of the most common everyday chemical reactions and also one of the most important, since this is how plants produce food for themselves and animals and convert carbon dioxide into oxygen.