Which of the following materials is inherently fire resistive?

Exposure to weather and physical hazards is a potential disadvantage for what type of SCBA mount?

A. Seat mount B. Unmounted C. Backup mount D. Rear external mount

________ is a condition that occurs due to hypocalcemia. Bone is broken down to release calcium and is not replaced in sufficient amounts, so bone density decreases. 

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