How similar and different were the pre-classic, classic, and post-classic societies of South America?

The differences a similarity of the three periods is given below.

Explanation:

During the pre-classic period many pyramids, palaces, temples and cities were developed. The society during this period followed the practice of human sacrifice, worshiped many gods, and cultivated corn. Maya, Olmecs, and Zapotec were some of the civilizations that arose during this period. The Classic period saw the emergence of independent city-states throughout the Maya region. The Teotihuacan controlled the Valley of Mexico. During the Post-classic, many of the city-states were indulge in warfare, and there was progress in weapons and population growth. The Aztec empire emerged as a power over the Valley of Mexico region after the Teotihuacan.  

164 kids

165 adults

step-by-step explanation:

first you need to make two equations

kids = x

adults = y

first equation = x+y=329

second equation = 1.5x + 4y = 906

solve by substitution

x = 329 - y

1.5 (329 - y) + 4 y = 906

493.5 - 1.5y + 4y = 906

combine like terms

2.5y = 412.5

y = 165

plug back into one of the equations

x + 165 = 329

x = 164

they were all fought in the middle east during ww1