It is due to their ability to adapt in the varying circumstances
The correct option is : Land
At the beginning of the 19th century Spain offered generous parcels of land in Las Floridas to attract settlers and they began to flow both from Spain and from the United States. The American settlers began attacking indigenous settlements that took their revenge by making incursions into US territory. The army of the United States began to cross the border with Spanish Florida to persecute the Seminoles.
Answer:
<em>B. The Ural Mountains separate European Russia from Asian Russia.</em>
Explanation: