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Final answer:Beth's ability to recover and maintain normal cognitive abilities after ahemispherectomyis best explained by Neuroplasticity. This biological concept represents the adaptability of the brain, allowing it to rewire itself, create new connections and compensate for losses, especially in young age.Explanation:The best explanation for Beth's recovery and development of cognitive abilities isNeuroplasticity. Neuroplasticity refers to the adaptability of our nervous system, encompassing changes such as the creation of new synapses, changes in glial cells, pruning of redundant synapses and even the birth of new neurons. Especially in young age, our brain is strongly plastic, therefore able to compensate for losses, as seen in Beth's case. A hemispherectomy, like the one Beth went through, is a drastic way to treat severe epilepsy. Despite possible initial deficits after the surgery, the patient's nervous system, especially in the case of children's highly adaptable brains, can recover remarkably.Our brains are divided into two hemispheres, connected via the corpus callosum. Usually, some functions are more predominant in one hemisphere. When a hemisphere is removed or the corpus callosum gets cut to treat epilepsy, this results in constraints for certain brain activities. However, with neuroplasticity, our brains have the ability to rewire, adapt and thus recover a great range of functions. This is a crucial component in Beth's recovery.Learn more about Neuroplasticity here:brainly.com/question/36460702#SPJ11...