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.
Compulsory school age is 5 years old. Children can enter kindergarten early (at age 4) contingent on a local school board decision that the child demonstrates capabilities warranting admission to kindergarten. Local school districts are required to measure the school readiness of entering kindergarteners via an approved assessment system.