Final answer:
Living organisms, including humans, plants, and bacteria, respond to changes in their environment through behaviors like shivering and sweating in humans, phototropism in plants, and chemotaxis in bacteria.
Step-by-step explanation:
All living organisms detect changes in their environment and respond to them. For humans, an example of a direct response to a change in the environment would be when we shiver in response to cold temperatures and sweat when it's hot. These responses are ways our bodies adjust to maintain a stable internal condition, a process known as homeostasis.
Plants also show responses to stimuli which is evident when they bend toward a source of light, a process called phototropism, or when they climb on structures or respond to touch. Bacteria exhibit chemotaxis and phototaxis, moving toward or away from chemicals or light, respectively, which are their ways of responding to environmental stimuli.