4. Factories often release harmful substances into the atmosph substances pollute the air. An engineer wants to reduce air pollution
coming from a factory. First, she focuses on pollution from ash. She
places different materials over a model of a chimney to stop particles of
ash from getting into the air. She measures the amount of pollution that
each material catches and makes a graph of the results. *
28
24
20
16
Amount of Particles Removed (mg)
12
00
Material 1 Material 2 Material 3 Material 4
Material Designs
What should be the engineer's next step?
A Find and fix any problems with Material 4
R Make and sell Material 1 to nearby factories

before there were tanks, machine guns, windmills, and solar panels, the first civilizations emerged that create the history of humanity which provided the larger context for western civilization. uses of weaponry and technology were used very differently in the ancient civilizations than they are today. relating back to the times of the ancient mesopotamian civilization, technology kept advancing throughout the ancient egyptian civilization into the ancient greek civilization, and then finally the ancient roman civilization. as techniques and strategies were past down from civilization to civilization, each shared its own similarities, as well as varied differences. one trait they had in common was to commit violence and economically overpower one another. technology has ultimately advanced due to the knowledge transferred from generation to generation. uses of sophisticated weaponry and devices have created more opportunity for warfare and improvement in the work place. ancient civilizations became more powerful due to the advancements of technology. technology did not only create the use of violence, but it also the economies grow and become stronger, because production of trading goods rose like never before. the rivers, such as the nile, tigris, and euphrates all flourished, as well as destructed civilizations. each civilization had different uses for these rivers, however, some benefited more than others. when analyzing ancient civilizations, there   are things you must understand

explanation:

an era of negotiation.

is that an answer to your question?

c is your answer have a great day make the brainlest

if you're talking about (ww2) they went bankrupt and their currency was worth nothing

explanation: