In this task, find the most appropriate number to replace the blank (indicated with _ ) and express it in words.

Q: Sociobiology is the historical outgrowth of _ prerequisite trends.

A: three
****
Q: Melanocytes are dendritic and are distributed roughly _ per six basal cells.

A: one
****
Q: Individuals communicate at _ levels - conscious and unconscious.

A:
two
****