Which stage of the human life course became a clear and distinct stage only in modern societies?

The answer is "childhood".

Childhood is the age length going from birth to adolescence. According to Piaget's theory of cognitive development, childhood comprises of two phases: preoperational stage and concrete operational stage. In developmental psychology, childhood is partitioned up into the formative phases of toddlerhood (figuring out how to walk), early childhood (play age), middle childhood (school age), and adolescence. Different childhood elements could influence a man's state of mind formation.

answer; /// the only one thats make little sense is (c) fair credit billing act;

this headline suggests that midterm congressional   elections are at the corner and trump administration wants to activate his base by vowing to clamp down on immigrants and immigration as trump had said during his election campaign around two years ago. when a baby is born in usa, the baby becomes citizen of usa for 85 years and trump wants to end this rule of birthright citizenship to control illegal immigration and this what he said in an interview""we’re the only country in the world where a person comes in and has a baby, and the baby is essentially a citizen of the united states for 85 years, with all of those benefits,” "