The fossils which are plants and animal remnants change over time. The Law of Superposition is a law that governs the geochronology, which states that in any undisturbed sequence of rocks deposited in layers, the youngest layer can be found on the top and the oldest can be found at the bottom, with each layer being younger than the one under it and older than the one above it.
These elements works in a synergy to explain and to help persons of interest understand the idea of evolution which stresses out that the modern day species came from a distinctively different species.
Answer Migration, in turn, covers both immigration and emigration. Another key difference is, immigration is permanent while migration doesn’t have to be. People who travel and stay in a country for a few months — for instance, because of a seasonal job they have — are also called migrants.
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