13. What is the benefit of using two-stranded barbed wire? (A) Improved rust-resistance (B) Increased strength (C) More rapid attachment of barbs (D) Easier installation.

9. The passage supports which of the following generalizations? (A) The presence of the Spanish threatened Anasazi society. (B) The Anasazi benefited from trading relations with the Spanish. (C) Anasazi society exhibited a well-defined division of labor. (D) Conflicts between neighboring Anasazi villages were easily resolved.