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Gregory issues his challenge to the theories that underpin migration studies by urging us to integrate racially migration ’ s effects and not merely its causes . Students explore migration patterns and the many factors that influence relocation and mobility . The existence of vertically migrating scatterers is inferred from both the backscatter signal intensity and vertical velocity data , which indicate migration rates of 2-3 cm s-l , and shows consistency between the displacement deduced from the vertical velocity and the observed movement of scatterers from the near bed to the near-surface regions , evident in temporal variations in the backscatter signal intensity . Factors that may contribute to wire strikes are migration patterns and inclement weather ( especially fog ) . In response to our work , funding agreements now target future health and education funds provided to the Federated States of Micronesia and the Republic of the Marshall Islands in ways that address migration problems from these countries .