6. A Neolithic man had to specialize in a job. He was good at sewing and he was good at plowing fields. The man chose to specialize in sewing. What was his opportunity cost?
a. Plowing fields
b. Sewing
C. Cooking
d. Painting

Jennifer is visiting her grandmother, who lives in the northeast corner of oklahoma. the region is home to many lakes, and jennifer enjoys canoeing on the illinois and grand rivers. to which region of oklahoma is she traveling? the prairie plains, the ozark plateau, the red river plains, the red beds plains

At a continent-continent convergence,

How do oceanographers measure the salinity of ocean water?