foreign high in the sky it uses its Keen sense of sight to search for fish in the lake below when it spots a fish it Dives down and catches it in its sharp talents all organisms respond to stimuli a stimulus is a change or signal in an organism's environment that the organism can recognize and react to in the case of the eagle the stimulus was spotting the fish in the water the reaction to that stimulus is called a response the Eagle's response to seeing the fish was to swoop down and catch it responses help an organism survive and adapt to its environment plants for instance have unique ways of responding to stimuli many plants react a lot a process known as phototropism sunflower plants turn their heads to follow the sun across the sky soaking up as much sunlight as possible for photosynthesis another type of response in plants is towards gravity process known as geotropism this response guides roots to grow downwards into the soil and Stems upwards Towards the Sky an interesting example of plant response to stimulus is the venous fly trap this carnivorous plant closes its leaves when an insect lands on them capturing its prey for digestion animals also exhibit a wide array of response to stimuli for instance a rabbit upon sensing a predator instinctively runs to escape demonstrating a basic survival mechanism simile when a gazelle senses a change in the wind direction carrying the scent of a predator it quickly Alters its course to avoid detection Birds too respond to seasonal changes as winter approaches many species migrate to warmer regions ensuring their survival during harsh weather conditions even a simple organism like an earthworm reacts to light by moving away from it preferring to stay hidden in the dark soil even the simplest organisms such as single-celled amoeba or paramecia have the ability to respond to stimuli for example if these microorganisms encounter a harmful substance they will move away from it but if they detect a food source they will move towards it these examples demonstrate that the capacity to respond to stimuli is an essential characteristic of all organisms helping them interact with their environment adapter changes and ensure their survival [Music] don't forget to subscribe