There is generally time to transport a woman in labor if her contractions are at least _____ minute(s) apart

When payments are over ________ days past due, they become very difficult to collect

a. 30 b. 60 c. 90 d. 10

Which kind of bone cell tears down bone to release calcium and phosphate into the blood?

A) osteoprogenitor cells B) osteoclasts C) osteoblasts D) osteocytes