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.
Pre-K. 1  Pre-kindergarten content standards. 2  Early childhood education provides preschool programs for 3- and 4-year-old children of income-eligible families. 3  Immunization requirements.  Preschool vision screening guidelines.