Understanding the human body is a team effort. That's where the Yachtel group comes in.

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This is Scientific American's 60-second science. I'm Christopher in Taliatta.

The way we sample much of the world's oceans to see what's living down there is pretty basic.

Ask fishermen.

Or just stick a net down there and examine what we catch.

Neither method is ideal.

Because you basically catch the fish and kill them.

Philip Francis Thompson, a biologist at the Natural History Museum of Denmark. Another drawback,

he says, is you can't do it everywhere. If the bottom is too soft or too rocky, or if there's a

coral reef, for example, you don't want to use this invasive method above sensitive habitat.

So Thompson and his team investigated an alternative that's been used in freshwater with some success.

They sampled the diversity and abundance of marine life using something called environmental DNA, or eDNA.

Basically, genetic material that fish leave behind.

So that is all sorts of bodily fluids that are expelled from a fish during his lifetime.

And beyond its lifetime, too.

Like when one fish gets eaten and its remains get expelled in the fecal matter of another.

Bingo, E-DNA.

Thompson and his colleagues sampled seawater at various steps off the southwest coast of Greenland,

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