One Word Substitution : Set 24

The study of duration of life	Chronology
The art of making fireworks	Chromatics
The study of cells, especially their formation structure and functions	Cytology
The study of finger prints for the purpose of identification	Dactylographic
The study of animal behaviour	Ethology
The study of production of better offspring by the careful selection of parents	Eugenics
The study of effect of environment on workers	Ergonomy
The sun therapy	Heliotherapy
The study of tissues	Histology
The study of teeth	Odontology
The study of correct pronunciation	Orthoepy
The art of method of teaching	Pedagogy
The study of rocks	Petrology
The study of written records their authenticity etc.	Philology
The study of speech sounds and production, transmission , reception	Phonetics
The study of human face	Physiognomy
The study of ancient writing	Palaeography