pond

And let me give you another example of media, from across the pond, in around 370 BC.

Enter producers: also known as the plant kingdom, the cyanobacteria in your local pond, and the phytoplankton in the ocean — and all the other photosynthetic organisms.

So the next time you see a swarm of mayflies over a pond, bridge, or park fountain, remember that their short aerial dance means a healthy world exists below the surface.