Question 4 Which of the following helped lead to an increase in the food supply in Europe?
the development of a two-field system
the switch to using oxen to plow fields
O a slightly cooler climate
the use of a new harness for horses

the 2nd one

Explanation:

it usually helps to switch things up

answer; self-efficacy;

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.