Hydras would avoid reproducing asexually when conditions are difficult primarily because of the risk associated with a lack of genetic diversity. Asexual reproduction produces offspring that are genetically identical to the parent, which can make the entire population vulnerable to specific threats such as disease, environmental changes, or other stressors. If all hydras are genetically identical and a condition arises that is unfavorable to their specific genetics, such as a pathogen or a drastic change in climate, it could potentially lead to the death of the entire population.
In contrast, sexual reproduction creates genetic diversity among offspring, which can enhance the chances of survival for at least some individuals in a changing environment. This genetic variation allows populations to adapt to new challenges and reduces the risk of complete die-offs.
Therefore, the most accurate reason for hydras to avoid asexual reproduction in difficult conditions is that the lack of genetic diversity could mean that all of the hydras die, depending on the situation.
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