Answer:
USC: Encounter with crocodile
UCR: Anxiety and fear
NS: Clock ticking
CS: Clock ticking
CR: Anxiety and fear
Step-by-step explanation:
USC: referred to as an unconditioned stimulus is an involuntary reaction that occurred immediately he encountered the crocodile.
UCR: referred to as unconditioned response and as a result of his encounter, he is Anxious and full of fear.
NS: refers to nuetral stimulus an d it happens naturally as a result of the thought of the incident. As he hears a ticking Clock he gets a flash of the event.
CS: refers to conditioned stimulus and it occurs immediately he hears the clock ticking, it makes him aware of the event even though he doesn't necessarily need to respond.
CR: referred to as conditioned response and it is caused by the CS because bof the awareness created by the CS his response becomes anxiety and fear.