Which of the following are all examples of pollution contributors?
a. cars, people, factories, plants
b. cars, people, factories, schools
c. cars, people, factories, trees
d. cars, people, factories, animals

d. new methods of assembly are introduced.

explanation:

this allows for the goods to be made on a larger scale. not faster because now it is shown to be made better, hence the greater productivity in the question. it is calling for something new to be introduced.

answer(c) carved on a babylonian clay tablet that showed earth as a flat circular disk;