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.
Childcare centers are generally an option for working parents who need their children to be taken care of during the day; centers accept babies as well as toddlers and are full-time, full-year programs. Preschool refers to an early-childhood educational class for 3- and 4-year-olds. Many offer a part-time schedule (for example, a few hours a day, two to five times a week) as well as full-day care, but only from September to May. Yet the terms are often used interchangeably.