sea turtles have flippers that are adapted for swimming and they are vulnerable on land.
Female sea turtles make lots of babies when they lay eggs. when they are going to the ocean after being born they have to cross many predators that results in many sea turtles being eaten, and once they go in the water they get eaten by sea creatures.
the female sea turtles have lay hundreds of eggs, and the sea turtles that have stronger flippers will get to the ocean quicker and live their life to survive and reproduce.
change in gene pool
the sea turtles that are stronger and faster and survive will reproduce and their offspring will have the same adaptation that will help them survive and reproduce so this means that the next generations will have stronger flippers and survive.