This marks the era of the Bikonts, the lineage that produced all modern plants and algae. These cells moved like tiny rowboats, using two flagella at the front of the cell to “pull” themselves through the water. Imagine a cell being towed by two microscopic proto-limbs. When plants later moved to land and became stationary, they largely retired these “pulling” motors, but the legacy remains in the rare swimming sperm of primitive plants like mosses, which still “pull” themselves toward an egg.