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.

every society, in order to meet the needs of it's people, has to answer three basic questions:

- what should we produce?

- how should we produce it?

- for whom should we produce it?

this questions must be answered in order to, option b, aid in production decisions.

every country can't produce everything, no matter how rich their land is. it may be a matter of technology, resources or geographical conditions. so, these three questions must be resolved in order to get the most of the production of each land.

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answer; the merit selection, also known as the missouri plan;