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.
Most children start preschool at the age of four years and attend for 12 months prior to commencing school. In Victoria, a child must turn four years old by April 30 in the year they start going to preschool. A child in Tasmania must be aged four by January 1 in the year they enrol in kindergarten.