A puff of air to the eye causes a reflexive blink. If you precede the puff of air with a buzzer, eventually the buzzer will cause a blink. In this example, the buzzer begins as the and eventually becomes the

The answer is neutral stimulus and conditioned stimulus, respectively.

Explanation:

In classical conditioning, a conditioned stimulus is associated with an unrelated consequence, called unconditioned stimulus. This produces a reaction known as conditioned response.

The passage illustrates the fact that any neutral stimulus can become conditioned, as long as it's paired with an unconditioned stimulus. For example, instead of a buzzer, the stimulus could have been a coloured light or a different sound. When associated with the puff of air, it would become conditioned.

the period of human evolution has coincided with environmental change, including ('hominin' refers to any bipedal species closely related to humans – that is, on how do we know earth's climate has changed? a map showing dates and locations of prehistoric archeological sites and migration routes from africa into.