The natural distribution area of Common hackberry is located in eastern North America. The tree is susceptible to fire damage. The fruits are eaten by birds and other animals.
Memory development. The development of memory in children becomes evident within the first 3 years of a child's life as they show considerable advances in declarative memory. This enhancement continues into adolescence with major developments in short term memory, working memory, long term memory and autobiographical memory.
Some research has demonstrated that children can remember events from the age of 1, but that these memories may decline as children get older. Most psychologists differ in defining the offset of childhood amnesia. Some define it as the age from which a first memory can be retrieved.