1. one who studies relation between organisms and environment.   Hint First letter clue   2. ancestors.   First letter clue   3. person who worries without cause (about his health).   First letter clue   4. person who studies fishes.   First letter clue   5. one who breaks images and attacks cherished traditions.   First letter clue   6. clumsy or rough-mannered person.   First letter clue   7. person with morbid tendency to drink alcohol.   First letter clue