Crossword Puzzle Dendrologists' study

Clue: Dendrologists' study

Study of morality (ETHICS with 6 letters)
Source of the headline "Study Finds Blame Now Fastest Human Reflex," with "The" (ONION with 5 letters)
Thorough study: Abbr. (ANAL with 4 letters)
39th of 50 (NORTHDAKOTA with 11 letters)
Arborist's study (TREE with 4 letters)
Fine study (ARTS with 4 letters)
Places to study anglais, perhaps (ECOLES with 6 letters)
Sociological study (e.g. MORES with 5 letters)
Genealogical study (ROOTS with 5 letters)
Entomologist's study detail (INSECTWING with 10 letters)