SORU: anlam bakımından parçanın bütünlüğünü bozan cümleyi bulunuz
(I) Scientists believe that the centre of the earth is like an enormous magnet, giving out a steady magnetic force. (II) This slowly moves away from the centre and up to the surface. (III) By the time it reaches the surface, the force is very weak. (IV) When there is a sudden increase in magnetic strength, many migrating animals have difficulty finding their way. (V) Accordingly, it gives different measures at different parts of the world.