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This test is run by .
Note that your final mark will not be saved in the system.

11. Food chains and webs Reorder

Running Total

Attempt

1 of 3

Drag and drop the boxes into the correct order.

Toxic substances such as mercury can be stored in the bodies of plants and animals, and can accumulate in the food chain.

Arrange these sentences in the correct order to describe how mercury pollution in oceans could be harmful to humans.

Large fish feed on the small fish.
When humans eat the large fish, their bodies may contain harmful amounts of stored mercury.
Humans catch the large fish for food.
One fish can eat a lot of plankton, so it consumes many doses of mercury.
Small fish feed on the plankton.
Factories release industrial waste containing mercury into the ocean.
Tiny plants and animals called plankton absorb the mercury through their cell membranes.
Each large fish eats a lot of small fish, so it gets a higher concentration of mercury with every fish it eats.

This is your 1^st attempt! The marking algorithm gives more marks for getting the right order first time.

Pass Mark

70%