A positive feedback mechanism is the exact opposite of a negative feedback mechanism. ... In a positive feedback system, the output enhances the original stimulus. A good example of a positive feedback system is child birth. During labor, a hormone called oxytocin is released that intensifies and speeds up contractions.
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When the body is given weakened/dead pathogenic material this helps build up an immune system towards the actual live infection. It prepares the body for the infection so that the person does not get sick.
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Answer:
They were indeed innovative despite their lack of civilization
Explanation:
Prior to European contact the Natives were doing well in the areas of agriculture as they were innovative. Some of their agricultural products are Maize, Squash and Beans.
It will be fair to say that European contact with the Natives divided the tribes and lead to the death of many. Diseases such as Chicken pox and measles, typhus, came after European contact.