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.
At age three, Caring for Your Child states that a small child is no longer a toddler.. Instead, a child of this age is considered a preschooler, even though children younger than three often attend preschool (and many children never attend preschool at all. This perspective on toddlerhood is echoed by the Center for Disease Control (CDC). According to their website toddler are one to two years of age.. The beloved What to Expect During the Toddler Years, also state that toddlerhood includes the second and third years of a child's life.