What does sensitivity/stimuli refer to in the context of living organisms?

Sensitivity or stimuli in the context of living organisms specifically refers to the response to environmental changes. Living organisms possess the ability to detect changes in their surroundings—this could include variations in temperature, light, sound, or the presence of other organisms—and react accordingly. This responsiveness is crucial for their survival, as it allows them to adapt their behavior or physiology to better suit their environment.

For instance, plants may bend towards a light source, animals may flee from predators, or humans might pull their hand away from a hot surface. This ability to respond to stimuli is an essential characteristic of life and highlights how organisms interact with and adapt to their environment, which is vital for growth, survival, and reproduction.