Describe what you are made of and where the materials that you are made of came from. Your description should be a minimum of 3-5 sentences. (It may help if you think about the levels of organization in science to frame your answer.) Try to include as many of the levels of organization as you can.

The phlogiston theory in the 17th century attempted to explain burning. the theory stated that combustable objects contained a material called phlogiston, a substance without mass, color, odor, etc. after objects burned, the objects were dephlogistonated and were then in their true form. the phlogiston theory was accepted until the 18th century, when lavoisier proved that combustion requires a gas that has mass. phlogiston is considered a) to be scientific knowledge b) not to be scientific knowledge c) to be proven by scientific method d) to be accepted in the modern scientific community

20 the compound al(nh3)2 has atoms of nitrogen.

Which step is not included in the step approach to calculating the greatest common divisor?