Under the constitution, the principle of "federalism" is the reason that power and responsibility are
a. shared by state and national governments
b. divided into three branches of government
c. limited to what is listed in the amendments

Isaac's approximate age is three years old. At the age of one a child generally learns to walk and run and can identify who is his immediate family and show them affection. By two they begin to understand simple things like what a cat is, what the color red looks like, and how old they are. By three the child will develop more gross motor skills that include: saying the alphabet, identifying shapes and colors, sorting toys based on size and type, and counting to numbers anywhere from 10 to 20 typically.