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.
1 A child this age makes great strides in being able to think and reason. In these years, children learn their letters, counting, and colors.  Emotional and social development. Between the ages of 2 and 5, children gradually learn how to manage their feelings. By age 5, friends become important.