Clam Cleanup Biologists Clam Up Waterways To Determine Sources Of Pollution

http://www.sciencedaily.com/videos/2009/0110-clam_cleanup.htm
Bye: Science Dayle
Published: January 1, 2009

Biologists are able to determent what type of toxic stuff is in the water by putting clams in the water so the clams suck up the toxins in the water and then the biologists can see when they detach the bode from the clam its self and then they can test it to see what was in the water. The local high school students had helped the biologists do that.

Some toxins in the water you can see, and some you cant. Like for an Ex, you cant see the chemical toxins that are in the water, but you can see toxins in the water like for an Ex, cups, old tennis shoos, tennis balls, and made even bigger things like bikes, stoves and stuff like that.They can contain very harmful toxins, like they ruin the waterways, what is in the water and it will destroy anything in it.
And here are a few quotes:
"We're using them as pollutant traps," said Harriette Phelps, Ph.D., a biologist at the University of the District of Columbia in Washington, D.C.

"It's been a great experience to actually come and see them and be the ones to pick them up out of the water," student Caitlin Virta said.

"We can trace them back to sources, and then hopefully we can go from there and get rid of the sources," Dr. Phelps said.