The scientific method is usually presented to students when they are between 12 and 13 years of age. at this point, students are capable of the abstract thinking and hypothetical reasoning characteristic of jean piaget's stage of cognitive development.

How does the principle of federalism affect the u. s. government? a. it guarantees that the united states will always be a representative democracy b. it ensures that the state governments have greater authority that the federal government c. it creates both separate and overlapping powers for the federal and state governments d. it divides the federal and state governments into three branches