Order the levels of bioaccumulation of toxins starting at the bottom of the food chain from 1 to 4.
1. several tons of producer organisms (plants and animal plankton) become contaminated with toxic chemicals, such as methylmercury
2. if none of the chemicals are lost along the way, a 150-pound person can receive all of the toxic chemicals that were present in the producers
3. the contaminants become more concentrated in 100 pounds of fish-eating fish such as lake trout, walleye, and bass
4. the contaminants become more concentrated in a few tons of plankton-eating fish such as bluegill, perch, stream trout, and smelt