What is meant by oesophagus

This is the process of making a prediction based on the results of prior observations of similar events.

Which label correctly identifies what x represents in the concept map?

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.