Which selection from the article helps the reader understand that studying otters can help scientists understand the overall health of river ecosystem

Answer and Explanation:

Hello. You did not enter the text to which this question is related, nor did you show the answer options, which makes it difficult to prepare an answer.

However, we can say that otters only live in ecosystems with clean water and a large amount of healthy fish. In this case, studying the ponds where the otters live and the places where they do not want to settle, shows scientists the ecosystems that are healthy and preserved and those that are not.

These information must be given in the article to convince readers that the study of otters can inform scientists about the health of ecosystems.

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.