Which marketing adage states that a person needs to see or hear something at least seven times before he or she remembers it? According to an old marketing adage - the Rule of BLANK , a person needs to see or hear something at least seven times before he or she remembers it.

yes, since there is a positive and a negetive if the positive and negitive wasn't there wouldn't a flow electricity in it.

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.

the above statement/question is (true);