The term for an organism's response to its environment is known as stimulus-response or simply response. Organisms interact with their surroundings via a series of stimuli, which can lead to behavioral or physiological changes. Responses can be voluntary, such as moving toward food, or involuntary, like reflex actions. This ability to respond is vital for survival, allowing organisms to adapt to changing conditions and threats. Understanding these responses is essential in fields like ecology and behavioral biology, revealing how organisms cope with their environments.