The crossword solution for the term 'Things That Evoke Reactions' is 'STIMULI'. STIMULI are external or internal events that can cause a response from an organism. STIMULI can be physical, such as light, sound, and temperature, or they can be chemical, such as hormones or neurotransmitters. STIMULI can also be psychological, such as memories or emotions. In all cases, STIMULI evoke reactions in organisms, ranging from simple reflexes to complex behaviors.