Thomas Edison created a commercially viable incandescent light bulb in 1879. How did this invention change the American workplace? A It forced workers to specialize in certain tasks. B It reduced efficiency in the workplace. C It allowed workers to work longer hours. D It led to the end of child labor laws.

What form of government is powers of states? first letter of the answer is r.

Which word best describes early america foreign policy ?

Which sentence best describes the relationship between chlorophyll and the chloroplast? a.)chlorophyll is a chemical found in a chloroplast. b.) chloroplast is a chemical found in a chlorophyll. c.) both chlorophyll and chloroplasts are found in animals. d.) both chlorophyll and chloroplasts make carbon dioxide.