The venus flytrap is an example of a loop feedback system. Even though they can some get nutrients from air and soil, it is healthier for them to get nutrients from insects. The leaves of venus flytrap open wide. As insects approach, the trigger hairs sense the movement. As they sense movement, the leaves snap shut. The trap then forms an air-tight seal in order to keep the digestive fluids inside and bacteria out. The digestive fluids dissolve the soft, inner parts of the insect, but not the exoskeleton. The trap will reabsorbs the digestive fluids and reopens. The leftover parts will be blown away by wind or rain. The trap is again ready for its next prey. This system is a cycle where the insects trigger the trap, the trap digests the insect and reopen for the next insect to come.
Credits:
https://botany.org/bsa/misc/carn.html
https://en.wikipedia.org/wiki/Venus_flytrap
http://www.learnnc.org/lp/editions/cede_longleaf/501
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