What is humus? don't spam dear

In the practice of science, this type of reasoning is used to develop explanations.

What class of levers is shown in this image?

The scales shown in the introduction measure mass, or the amount of matter in a particular object. the scientific law of conservation of mass states that matter cannot be created or destroyed during a chemical reaction, but it can change from one form to another. did the simulation support this scientific law? explain why or why not.