Turtles have strong shells to protect them from harm. The shell is made of hard bones plates. The shell is rounded to help the water glide over, allowing the turtle to move swiftly throught the water. However the heavy shell makes it hard for turtles to stop abruptly, as the shell weighs the turtle down. Another adaptation turtles have devloped are its four fat limbs. These limbs are more commonly known as the fins used to help swim. The flateness of the fins help propel the trutle through the water. The curved shape of the fins help the turtle propel the turtle, as they act as like a cutting blade through the water. The fins also help the turlte move faster as the limbs arent as thick or heavy.