The presence of weapons and precious metals and gems in ancient tombs tells us what about these societies?

They were crafty and used natural resources to make things that helped them live. They also explored more than we do and were able to find things that were far beyond belief.

Assemblies do not have written codes of laws. laws are matters for magistrates and courts, not assemblies. codes of law are things such as civil law, criminal law, and constitutional law. what assemblies have are procedures regarding debating, voting and other business they might carry out.  also note that rome had three assemblies: the assembly of the soldiers, the assembly of the tribes, and the plebeian councils.