All but one describes an effect of aging on the respiratory system. a) diminished lung volume capacity b) increased respiratory mucus production c) decreases in respiratory muscle strength d) oxygen content of arterial blood decreases

b oxygen content of arterial blood decreases

the product of the pressure and volume is also constant

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).