As life on Earth evolved and the environment became more complex, the survival of organisms depended upon how well they could respond to changes in their surroundings.
Once detected, these internal and external changes must be analyzed and acted upon in order to survive. Changes in the external environment include those of light, temperature, sound, motion, and odour, while changes in the internal environment include those in the position of the head and limbs as well as in the internal organs. SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!įollow the electrical and chemical changes undergone to transmit an impulse through the human nervous system See all videos for this articleĪll living organisms are able to detect changes within themselves and in their environments.
Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.
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