From what activity did the small African kingdoms along the West African coast become rich beginning around the 1500s? slave trade
sale of tobacco
sale of oil and natural gas
gold-for-salt trade

i want to say death; parole, probation, and fines are still being used all the time.

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.

answer; albert bandura;

answer; passive listening;