The earliest introduction of zebra mussels in united states probably occurs in 1986.
At that time, commercial vessels from Europe went to north America as a place for freshwater ballast stowaway. They merchants then introduced zebra mussels to the market and it gained popularity ever since. They also introduced zebra mussels population in local lakes and let them reproduce there.
Answer:
The correct answer is: The industrial area is located far away from the city center.
Explanation:
The Burgess model (also known as the Concentric zone model) is based on the idea that land has a higher value if it is located in the city center because the competition is high in central parts of a town or a city.
The main theory of the Burgess model is based on the fact that a fully developed city consists of five concentric rings, where certain social groups are located in specific areas. His model was based on the city of Chicago. It was made by sociologist Ernest Burgess in 1925.
Answer: "case study method" .
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Altocumulus and <span>Altostratus are two types of clouds that are between 20,000 and 6,500 feet in the air.</span>
