Which of the following is an example of a conjugate acid-base pair?

Iknow the answer is a but i don't know why

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both