The crossword solution for the term 'Things Provoking Activity' is 'STIMULI'. STIMULI are external or internal events that can cause a response in 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 emotions, memories, and thoughts. STIMULI can be used to provoke activity in an organism, such as a reflex or a behavior.