What are some external stimuli organisms face?

answer:

suppose you and your family take a camping trip to colorado. your father is trying to build a fire, and he asks you to collect some sticks for a fire. while you are searching, you encounter a huge bear. your immediate reaction would be to run away! this is a result of external stimulus. an external stimulus is a stimulus that comes from outside an organism and causes a reaction. when you see the bear, your brain immediately registers fear and activates the sympathetic nervous system, also known as fight or flight response. knowing that you cannot fight the bear and win, your brain opts to go with the “flight mode” option, so that you can flee danger immediately.

explanation: