Prehistoric native americans would have been most likely to use canals for which purpose?
a) irrigation of crops
b) to attack enemy tribes
c) to protect their settlement
d) to move goods from one place to another

The correct answer is A) Irrigation of crops

Explanation:

It is a very imprecise question.

Irrigation canals were built in sedentary indigenous settlements and the best example (if not the only one) is that of the Hohokam tribe, desert farmers who occupied the heart of Arizona and the northern part of Sonora in Mexico from the beginning of the first millennium to Almost in the middle of the second millennium. But it is an isolated case. The expansion of cultivation systems with artificial irrigation was due to the settlements of Spanish settlers in California, New Mexico, Texas and Arizona.

health care plans in the united states having high costs because they are focusing on providing quality programs for different groups of individuals. the quality of the service is based on money flow received from the members. without this investment, couldn't be possible a constant scientific searching to prevent death and illness caused because of low levels of health investigation. currently, the complaints are not about the highest cost, but about the coverage and benefits to access the necessary health services required by the members.  

besides, if a global health system is established the quality levels will fall down because of the standardized of the health. the access to care will increase but the quality will be low because it depends on the money invested.

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