Classical conditioning is the study of behaviors that are whereas operant conditioning studies behaviors that are voluntary; involuntary active; reactive reactive; active inactive; reactive

The answer is reactive; active. Although a basic feature of operant conditioning is support or reinforcement, classical conditioning relies more on link between stimuli and responses which makes it reactive. A second difference is that much of operant conditioning is based on voluntary and active behavior, while classical conditioning often comprises involuntary and reactive reflexive behavior.

Ribonuclease activity is a type of nuclease that catalyzes the degradation of rna into small components.