How do immigrants travel through Central America and Mexico to the United States? What obstacles do they face and what keeps them going?

According to section four, what is the most likely reason that a polyester blend fabric would make the project more difficult for amateur quilters?

Aman lives on the twelfth floor of an apartment building. every morning he takes the elevator down to the lobby and leaves the building. in the evening, he gets into the elevator, and, if there is someone else in the elevator -- or if it was raining that day -- he goes back to his floor directly. otherwise, he goes to the tenth floor and walks up two flights of stairs to his apartment.

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