Researchers are studying slider turtles. Slider turtles hatch on the beach and travel to the sea. The researchers discover that the larger baby turtles were more likely to survive than the smaller baby turtles. They hypothesized that the larger turtles could move more quickly toward the water than the smaller turtles, and therefore, the larger turtles reduced their exposure to predators. The survival advantage for the larger baby turtles is a result of