How did the development of agriculture affect Native Americans ?

It increased their population sizes, allowed for food surpluses, became important in their religious beliefs, and allowed for society to become stable.

Explanation:

Primarily, agriculture greatly increased the natives' populations sizes, now that their diets were more nutritious and varied.

Agriculture also allowed for natives to have food surpluses, as they grew large amounts of crops at a time and usually had extras.

The development of agriculture also made agriculture become important in their religious beliefs. Natives believed that religious ceremonies could allow for successful crop seasons and good weather for their harvests.

Lastly, agriculture allowed for society to become stable. Now that they had surpluses of nutritious food, population growth was steady and natives could live in settled, permanent societies.

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the perimeter of a triangle is 69 cm. side a is 5 cm shorter than side b. side c is twice as long as side a. find the length of each side. i need to know how to do it in 2 equations.  

equations:

a = b-5

c = 2a

a + b + c = 69