There is no diffrence in the nitrogen content of inspired and expired air. Suggest a reason for this.

the statements that apply here about binary star system are

"have stars that might appear to wobble"

"often have one star that is brighter than other"

a binary star is a star system consisting of two stars revolving around their common barycenter. systems of two or more stars are called multiple star systems.

answer; civil inattention;

answer; blending inheritnace;