The term for changes in the internal or external environment that cause a response is stimuli.
The term for changes in the internal or external environment that cause a response is called stimuli. Stimuli can be defined as any form of physical or chemical changes that excite a sensory receptor and elicit a response from an organism. It can come from various sources, such as light, sound, temperature, pressure, chemicals, or even internal changes within the body. When a stimulus is detected by sensory receptors, it sends signals to the nervous system, which then triggers a response. So, in this case, the correct answer is "stimuli."
