How did motility improve the fitness of early cells?

Motility significantly enhanced the fitness of early cells primarily by enabling them to navigate their environment effectively. The ability to move away from predators allowed these cells to evade threats that could lead to their destruction, thereby increasing their chances of survival. Furthermore, motility facilitated the movement towards nutrient-rich areas, enhancing access to essential resources necessary for growth and reproduction. This strategic movement improves overall survival and reproductive success, making motility a critical adaptation in early cellular evolution.

While increased reproduction rates, survival in extreme conditions, and overall size may contribute to cell fitness in different contexts, the direct impact of motility on survival through the ability to avoid predators and seek food sources distinctly illustrates its importance in the evolutionary success of early cells.