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.
In most states your child must be at least 5 years old to be eligible for kindergarten. Although most states are fairly strict in enforcing the deadline date (if your child is not 5 by the designated deadline, he must wait until the following year to start kindergarten), some school districts may allow parents to enroll their children if they turn 5 in the middle of the school year.