The population 2000 years ago was between 175m to 300m. the estimates vary because of the methods of estimation used by various demographics. the America was populated by the native Indians people at this time.
Answer:
Copper is obtained from chalcopyrite and aluminum is obtained from bauxite.
The two properties of copper and bauxite are,
1,They are good conductors of heat and electricity.
2,They are ductile and malleable.