Where plankton suffers, so does the entire ocean food chain. When environmenmental conditions change, often triggered by too much of a nutrient—such as nitrogen or phosphorus from fertilizer ...

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 ...

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Almost all food chains begin with a green plant. Here in the sea, seaweed and plankton do the job. A plant that converts the Sun's rays into energy is called a producer. They are the start of a ...