This reminded me of a visit to a national park here in Spain when I was a kid. We stopped by a small river and the instructor talked about how the presence of certain insects hinted about the...
This reminded me of a visit to a national park here in Spain when I was a kid. We stopped by a small river and the instructor talked about how the presence of certain insects hinted about the cleanness of the water.
This reminded me of a visit to a national park here in Spain when I was a kid. We stopped by a small river and the instructor talked about how the presence of certain insects hinted about the cleanness of the water.
Here is an article on the matter https://www.thoughtco.com/water-monitoring-and-aquatic-macroinvertebrates-1968647
Yeah, let's not repost memes like this. It seems interesting but is there a reliable source?