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.
Basically, normal toddlers and preschoolers learn by being told what to do and by being reminded each time. By age 3 or 4, the parent still is their external conscience, reinforcing their memory of what they're supposed to do.