| 1 | And we have a botanist named Fred Coville to thank. | |
| 2 | Forty-five years on, the French botanist's gardens have grown massive in scale. | |
| 3 | Some botanists hypothesized that the living cells of plants acted as pumps. | |
| 4 | I like to think of them as akin to mouths (botanists, forgive me!). | |
| 5 | The pattern made by the cells of a leaf' s stomatal openings can help paleobotanists to identify it. |