The purpose of the sensors on a horseshoe crab's tail is primarily to use light to adjust the crab’s inner clock. These sensors help the horseshoe crab regulate its circadian rhythms by detecting light, which is essential for synchronizing their internal biological processes with the day-night cycle.
What is the purpose of the sensors on a horseshoe crab’s tail?
to detect light in the darkness of the ocean floor
to make the crab’s eyes change every 24 hours
to use light to adjust the crab’s inner clock
to help the crab find a mate
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