The ________, or breastplate, forms the front middle portion of the rib cage. 

Which of the following explains why the collection process is sometimes ended?

A. The cost of continuing to pursue the debt is higher than the total amount owed or all collection attempts have been exhausted. B. All collection attempts have been exhausted. C. The patient tells the practice he does not want to pay. D. The cost of continuing to pursue the debt is higher than the total amount owed.

A type of bone cancer that originates from osteoblasts is ________. 

Fill in the blank(s) with the appropriate word(s).