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.
As many parents can attest, there's a lot of pressure to send your kids to preschool. In fact, three-quarters of children ages 3 and 4 whose families have incomes of $75,000 and above are enrolled in preschool. Katy, a mother of two in Vancouver, believes kids can do just fine without preschool. I think children can learn all they need to from their parents and the families they socialize with, but that the socializing is important -- being with other kids, making relationships outside the family, she says. That said, her 4-year-old son attended preschool part-time, and her 2-year-old daughter will as well.