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Law helps a civilization because it is one of the elements that binds a people together. When people have this unity, they have a national identity and the freedom to develop the traits and characteristics of their civilization. Law or rules were/are the first element of a society.
Olmec
Civilization is defined as a growing government and people. A civilization has one chosen ruler. Civilization is the place that we live in. If you want to get the idea of what it is like to rule a civilization, play the game Sid Meiers Civilization III. It's really fun and you learn what it's like to be a true ruler.
Tigris-Euphrates
No one is sure how it disappeared It could have been a natural disaster, or another civilization could have invaded them and took over.
Social Classes
The ancient Greece civilization had many characteristics but the most important one is bravery. It fought so many wars and also won so many. This is a true trait. :)
With only one number, you cannot - unless that one number happens to be the measure of the missing angle!
take it to a vet
deficiency disease
Buy one!
Because it have been stolen
The late civilization of Egypt is the time period from 664 B. C to 323 B. C. The power was moving from one centralized power to multiple local powers.
The use of (at least spoken) language is one of the key characteristics of human beings. All groups of humans have lagnuages, including nomadic hunters and gatherers. It's not a product of civilization.
It depends on the missing amino acid but since they are called essential, life processes will eventually come to a halt. Kwashiorkor is an example of one these.
Without communities it would be hard to live. In early civilization humans goal was to live and one of the 5 characteristics of a civilization is having an organized community. People live, eat, work, play and learn better inside a community.
A portion of this question is missing so a guess is being placed as to the intent. What is the relationship between an Ancient civilization and a Modern one? The historical phrase that it is necessary to know ones history or they are doomed to repeat it comes to mind. Through maintaining the lessons learned and skills carried forward from the Ancient civilization, modern civilization, society and technology grow faster and stronger.