Answer:
Because Mexico–U.S. migration represents the largest sustained migratory flow between two nations worldwide, much of the theoretical and empirical work on migration in the Americas has focused on this single case. Yet in the past few decades, migration has emerged as a critical issue across all nations in Latin America and the Caribbean. Indeed, over the past fifteen years, this region has changed its historical position from a net migrant-receiving region to one of the leading sending areas of the world.
Unsure. Although it has been proven that microorganisms can live out in space, no one has seen an organism native to planets besides Earth.
<span>the spiral arms of the milky way was made of: D. younger stars and gaseous nebulae
The spiral arms of the mily way was organized into four spiral arms, and since it was made of younger stars and gaseous nebulae, Spiral arms typically contain a higher density of interstellar gas and dust than the Galactic average as well as a greater concentration of star formation</span>
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</h2><h3>B. comparing rates of change on the Earth's surface today with the geologic record.</h3><h2>
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Here's some other possible answers:</h3>
Counting generations in the bible, comparing rates of change on Earth's surface today with the geologic record, calculating the cooling history of the Earth, estimating evolution rates from the fossil record
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