Identify and describe two contributions to civilization made by each of the primary south, meso, and north american civilizations.

South american civilization:
- The invention of various type of plants that could be used for medicinal purposes.
- The invention of various tools that could be used for artworks

Meso American civilization:
- The invention of early agricultural land structuring for irrigation system
- The invention of earliest calendar to distinguish time/period

North American civilization:
- Popularized the use of tobacco (now it become the most used drug in the world)
- Invent several techniques to raise animals.

12 days because 1/4 is 25% of 100 if 100 is equal to 1 pound then multiply 3 by 4 which equals 12