What are the underlying reasons for encephalization , and how did humans further develop as a result of it ?

The two major costs to encephalization appear to be developmental and metabolic (Bennett and Harvey, 1985b). All other factors being equal, bigger brains require a longer time to develop and are energetically more expensive to maintain.

lincoln presided over the union victory in the american civil war, which dominated his presidency. a former whig, lincoln ran on a political platform opposed to the expansion of slavery in the territories. his election served as the immediate impetus for the outbreak of the american civil war.