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It must be understood that during the previous rounds of natural disasters, the survivors had no stable source of food. The food distributed by the Imperial Court was essentially reserves stored before the disasters.
However, the emergence of ancient creatures, it seemed, brought disasters, but in reality, they provided those who had lost their food sources with a new one.
It was precisely because of this stable food source that married survivors were able to conceive and give birth to the next generation.
Moreover, the round of natural disasters before the resurgence of the ancient creatures involved plant mutations, which were depicted as terrifying in many movies and TV series from before the disasters.
When first faced with these mutant plants, the survivors were equally caught off guard.
But as time went by and after several trials, it was discovered that seeds preserved from before the disasters could be sown in the ground.