Instructions: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
Input: What happened to the ground to force some flowers to grow?, Context: Flower evolution continues to the present day; modern flowers have been so profoundly influenced by humans that some of them cannot be pollinated in nature. Many modern domesticated flower species were formerly simple weeds, which sprouted only when the ground was disturbed. Some of them tended to grow with human crops, perhaps already having symbiotic companion plant relationships with them, and the prettiest did not get plucked because of their beauty, developing a dependence upon and special adaptation to human affection.
Output:
the ground was disturbed