Final answer:
Organisms use feedback mechanisms to respond to stimuli and maintain stable internal conditions.
Step-by-step explanation:
Organisms have the ability to respond to both external and internal stimuli through a process called feedback mechanisms. These mechanisms help them maintain stable internal conditions, also known as homeostasis. External stimuli can include changes in temperature, light, or the presence of predators, while internal stimuli may include changes in hormone levels or nutrient levels.
For example, if a human body is exposed to a high external temperature, the feedback mechanism for temperature regulation kicks in. The body responds by sweating, which cools the skin and reduces the overall body temperature. This helps to maintain a stable internal temperature in the body.
In another example, if a person consumes a large amount of sugar, the feedback mechanism for blood sugar regulation is activated. The pancreas releases insulin, which helps to lower the blood sugar level back to the normal range. This ensures that the internal environment of the body remains balanced.