external characteristics are the shape, erect stance, height, color of skin/hair, size of the body, etc..
the internal characteristics are the skeletal and organ related… some also take into consideration the breathing, blood circulation, digestive, reproductive systems, etc.
I believe the answer is: Core
A nations is considered as a core of world's economic system if every economic decisions that made by that country would most likely set up the economic trend for the rest of the world. Other example of nations that considered as a 'core' are: England, China, Russia, and Germany
I think it is B <span> By allowing more labor unions</span>
