What are the changes that must be made to a regulator to prepare it for use with Nitrox mixtures whose FO2 does not exceed 40 percent?

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck

B? i feel like this is a trick  

B. nuclear reactions could first occur.

Following are the  advantages of the parametric equations: 1) they can be used to graph curves that are not functions, like the unit circle.2) the parameter can be used to represent the quantity that is  useful to  provide us with better information about the graph.3)  it is useful to convert between rectangular equations and parametric equations.with specific reference to chemistry,  parametric equations are employ for solving hydrogen and hydrogen-like ions, quantum mechanically. herein, cartesian coordinates are converted in spherical polar coordinates. the solution obtained, when plotted on spherical polar graph paper, provides visualization of atomic orbital such as s,p,d and f.