Evolutionary psychology is a theoretical approach to psychology that attempts to explain useful mental and psychological traits—such as memory, perception, or language—as adaptations, i.e., as the functional products of natural selection.
Evolutionarily informed research has suggested that brains are composed of a number of specialized domain-specific mechanisms. For example, birds use different memory systems and different rules for remembering species song, the taste of poisonous food, and locations of food caches.
As people are always dying and babies are always being born so doctors don’t know the exact figure of the population, just an estimate. hope this helps x
