From Cells to Organisms: Levels of Organization
A single cell is small and simple, but living things are large and complicated. How do you get from one to the other? Through levels of organization — a ladder that starts at the cell and builds up, step by step, to a whole organism. Knowing this ladder helps you answer questions about how the […]
Photosynthesis and Cellular Respiration
A leaf can gain dry mass from carbon dioxide in the air. Where does the carbon go? Photosynthesis incorporates it into organic molecules, using energy captured from light. An animal that eats plant material can then transfer some of that stored chemical energy into ATP through cellular respiration. Photosynthesis uses light-driven reactions to help build […]
