What might be some limitations of basing an entire theory of cognitive development on observations of only three children?

articles are belowPleaserespond to the following questions. There is no length requirement, Iam more concerned with the thoughtfulness of your responses, rather thanthe length alone. Each question is worth 3 points each. Please seeattached rubric for information on scoring.1.) What might be some limitations of basing an entire theory of cognitive development on observations of only three children?2.) Compare and contrast the concept of development with the concept of differentiation, as they apply to basic reflexive schemas.3.) Why is the concept of functional invariance important for a developmental theory?