My smoke detectors (they're wired into the house and I think it also has a backup battery) went off around 4am last night, at first it was a beep every minute or so. My dad went to check it out and when he tried to turn on the lights they didn't work. A few minutes later the lights were back on and the smoke detector starting blaring but stop after a few minutes. I called the fire department but they really didn't have an answer for me. So is the short power outage the reason the smoke detector went off?
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I'm also struggling with this part of biology GCSE but I'm slowly grasping it. The stimuli is the change in the environment. As you said the iris Bright light (stimuli) - sense organs detect this (eyes) - the eye has light receptors.
