Explain why the mere existence of a command might not necessarily imply that you are obligated to obey it. give an example.

The existence of a mere command is not necessary because a single authority or command is free to control the whole country and people. The decisions taken by a single authority or command cannot be contradict and which sometimes can be harmful for the people or the citizens of the country.

The opposition is a necessary part in the running of a smooth and fair running of the government. For example - rule of Adolf Hitler. He created difference between German people and Jews.  

answer; (d) one tectonic plate plunges beneath another; (most common,convergent boundaries)

one way archaeology us understand the past is through the material objects it finds, allowing us to know what was being used, and when. for example a dig recently found a flute, believed to be the oldest musical instrument found to date.

i hope this