1.) In which year did the consumption of coal pass the consumption of wood? 2.) when did petroleum consumption begin?

3.) when did petroleum consumption become greater than coal consumption?

William poole believes economics should be taught in schools because students will learn

Astudent is revising the sentence below: i know brendan was upset, but i feel he overreacted. you would have thought he'd just lost his best friend, the way he would bemoan his fate. based on the context of this sentence, which is the best synonym for bemoan? a. complain: express dissatisfaction or annoyance b. grieve: cause distress to someone c. nag: annoy with persistent fault-finding d. provoke: stimulate or incite

Why is it essential to operationally define the variables in a study?