Difference Between Convergent and Divergent Evolution. When considering living organisms, evolution can be defined as the development of differentiated organisms from less differentiated pre-existing organisms over the course of time. There are many sources, which provide evidence to the theory of evolution.
You're apparently differentiating between daycare and preschool, right? Private preschools (about $500 per month for three days per week, 9:00a to 1:00p) typically have a minimum age of 30 months (2.5 years) and potty-trained.
How old does a child need to be to start kindergarten? A total of 32 states in the United States require that a child be 5 years old on or before September 1 in the year he or she starts kindergarten, with 11 states having a cutoff date between September 1 and October 15.