Levels of lead and other heavy metals spiked in L.A.’s coastal waters after the January fires, raising serious concerns for ...

The diagram shows how mercury can accumulate in the food chain. In the sea, tiny animals and plants called plankton absorb the mercury compounds. When the plankton are eaten by small fish ...

All other life ever identified, on land or in the sea, derives its energy either ... providing nutrients for animals higher up the food chain. Some creatures, such as the mollusks known as ...