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.
The Kindergarten entrance cut-off age in the U.S. varies from one state to another. In most states, a child must be at least five years old before starting school. Therefore, children are typically at least eight years old by the time they enter third grade. There are a few exceptions to this generalization. If a child skips a grade, he might be younger than eight. Additionally, if the child is held back, he might be nine or ten in the third grade.