Answer:
unconditioned stimulus
Explanation:
In Pavlov’s classical conditioning experiment with dogs, the dogs salivated naturally when meat powder was presented to them. The dogs’ salivation is referred to as the unlearned natural behavior (unconditioned response), while the meat powder that elicited the salivation is termed the <em>unconditioned stimulus (UCS).</em> The meat powder is the unconditioned stimulus that brings about a natural response of salivation in the dog, which is unlearned as a reflexive response.
B : taking oxygen into the body
Reliable is not one of the Three R's.
There are several processes used to explain the removal of dirts or contaminants from surface, but the general name is called Cleaning
Cleaning is an umbrella name that involves the removal of visible soils mater from surfaces, there are other types of cleaning that involves the removal of non-visible matter from surface too e.g sterilisation.
Sterilisation refers to specific action taken to reduce the hazard posed by such contaminants, as opposed to general cleaning.
Learn more about cleaning here:
brainly.com/question/19819390
