Answer: In theories put: An explanation of how or why a phenomenom occurs, supported by experimentation
And In Laws put: Supported by observation, and often a mathematical relation
If this isnt right Im extremely sorry :(
<span>moral principles that govern a person's behavior or the conducting of an activity.</span>
I think it depends on the question, but primary source is probably more reliable because it would be the original document. For example a diary of documented events from an explorer for example would be more reliable then a website about it. Have a nice rest of your day :)
Answer:
To ship goods to different parts of the country
Currency.........................
