What is the outcome of all chemical changes when two substances are combined?

This is called a chemical reaction. Gas may form, heat may be produced, and color may change.

Explanation:

the deaths of over a million communist soldiers

post-traumatic stress disorder in veterans

answer: both considered peasants valued members of society.

explanation: the ancient chinese and indian empires were large asian empires that had the same problems with other big empires, they had to work hard and sometimes fight in order to keep them united, they both relied heavily on their capacity to trade and to send strange and rare items to europe, and had the father as the head of the house hold in both societies, but they didn´t considered pleasants as valued members of their society, they were the bottom of the social pyramid in both of their societies.