This is cyclic change because the population is consistently going up and back down.
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A study created to make genetically modified orginisms.
The correct answer is: a tourniquet.
The tourniquets are tight straps around an arm or leg and tightened to stop bleeding, used to control arterial and venous blood flow. In the past, tourniquet are used to control bleeding during amputations. Now, a tourniquet is used in surgeries to block arterial blood flow following and to minimize blood loss.
Answer:
this is called revolution ( when the sun gives light to the earth it takes a step closer to revolution were season of the year appear )