mimosa pudica (aka sensitive/shy plant) is known for its crazy fast movement. when stimulated, the cells in each leaf flush out their potassium ions from the central vacuole- the part of the cell that stores water. when the vacuole is deflated, the leaves lose their rigidity(turgor) and collapse inward.
During the Cretaceous Period, dinosaurs were more diverse, more fierce, and more strange than ever. But something else was happening under the feet of the terrible lizards: for the first time in history, there were flowers.