To reward settlers for their service to the Crown, Spain established the encomienda system. It gave settlers the right to tax local Native Americans or to make them work. In exchange, these settlers were supposed to protect the Native American people and convert them to Christianity.
The answer to the question that you are seeking an answer to, is true.
The correct answer is growth of new neurons
We are able to create new neurons, even in adulthood. The discovery is relatively new, because it was thought that we were born with a certain “neuron bank” that was decreasing with time and that we were not able to increase. However, the latest findings in neuroscience have overturned that belief. Our brain is plastic: we can create different connections and even, in some areas, like the hippocampus, we can make new neurons be born.