Validating is a way of Multiple Choice disagreeing diplomatically. proving your point. asserting an opinion. checking your work. agreeing with others.

the invasive species was introduced due to commercial purpouses, as there was a demand for fur clothes and hence, a business opportunity connected to this product. actually, it was when the nutrias scaped, causing harm to the us ecosystems when they acquired the status of invasive species. in this case they have caused an environmental problem, but it could have affected also economic interests or even human health.

no the answer is c only objects touching the earth's surface can be acted upon by an outside force

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a)apline.     glad to ! : )