The theory of natural selection was explored by 19th-century naturalist Charles Darwin. Natural selection explains how the genetic traits of a species may change over time. This may lead to speciation, the formation of a distinct new species.
Answer:
zaragoza
Explanation:
Zaragoza was also very powerful and expansive, but inhibited by the neighbouring Christian states of the Pyrenees. Zaragoza, Toledo, and Badajoz had previously been the border military districts of the Caliphate.
