| 1 | A sea leopard behind a curtain of plankton. | |
| 2 | The cholera bacteria Vibrio cholerae can live on some species of plankton. | |
| 3 | Dust is a major source of iron, which is vital for plankton and other organisms that draw carbon out of the atmosphere. | |
| 4 | Dump iron into the sea to boost plankton growth and soak up carbon dioxide from the atmosphere. | |
| 5 | Scattered through the seas of the world are billions of tons of small plants and animals called plankton. |