Which three factors limit descriptive and comparative investigations? A. The features of objects that you cannot see
B. The way you must write hypotheses
C. The number of observations you can make
D. The number of variables you can have
E. The amount of time or money required

i don't know, but does anyone wanna be friends? i'm doing my homework at 1: 49 in the morning : /

the relative standard reduction potential of the half-cell in which reduction occurs; more positive than the other half-cell. reduction is a chemical process in which electrons are added to an atom or an ion; it always occurs accompanied by oxidation of the reducing agent.