<span>People moved from large cities in the East to settle in the Western Territories.--new transportation and territories open up with cheap land drew people west.
Western migration eased the crowding of Northeastern cities and provided a group of people to farm and provide food for the growing industrial centers through the North and Midwest. Railroad transportation allowed for easier travel to the West as well as roads and canals. </span>
<span>Logic, emotion and morality
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Pioneer settlers were sometimes pulled west<span> because they wanted to make a better living. Others received letters from friends or family members who had </span>moved west<span>. These letters often told about a good life on the frontier. The biggest factor that pulled </span>pioneers west was the opportunity to buy land. On their journeys which were thousands of miles, they encountered disease, treacherous roads and enemies.<span> Traveling rough roads in covered wagons often resulted in death from failed river crossings, accidents or Indian attacks.</span>
Answer:
Cause: human
Solution: evolution
The hunters chose to harvest the sheep with the larger horns. Only smaller horned sheep survived and reproduced, so, over time the population had smaller horn size.
Explanation:
The trophy hunting (the bigger the better) on bighorn sheep has caused artificial evolution. The human selection (and killing) of sheep with large horns has led to the survival of sheep with smaller horns. It is a form of <em>artificial evolution </em>because in <em>natural evolution </em>bigger horns means to be better armed.
