<span>Speciation because it is the formation of new </span>species<span> as a result of geographic, physiological, anatomical, or behavioral factors that prevent previously interbreeding populations from breeding with each other. Hope this helps! </span>
<span>Increased trade created a merchant class
</span><span>Small villages disappeared as workers moved to the cities</span>
<span>C) The Tigris and Euphrates Rivers provide fertile land for farming.</span>
