Answer
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Food Shortages - Moved to south

Too much or too little rain - built an irrigation system

Attacks by neighboring communities - built walls and moats

Irrigation system crossed village boundaries - worked together for the common good (keep water system moving)

Explanation:

1) Driven by the need for food, they searched elsewhere

2) They store that extra rain in an irrigation system to use for when there is little rain.

3) They defended themselves from neighboring communities attacking them by building walls and moats.

4)  They kept the water system moving.

I would like to apologise in advance if any of these are incorrect.

the answer is b: the religion they practice.

here's why:

there were many different native american tribes and those with similar characteristics formed a main tribe or nation. each had its own language, religion and customs.

d

step-by-step explanation:

look at the x and y axis