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Mercury is a common by-product of mining, oil-refining, and coal-burning and is found in relatively high concentrations in ocean water near these activities. Mercury is readily absorbed by algae and can biomagnify in these oceanic ecosystems.

Which of the following organisms would have the highest concentration of mercury?

A

Algae.

B

Krill, which eat the algae.

C

Small fish, which eat the krill.

D

Large fish, which eat the small fish.

E

Sea lions, which eat the large fish.

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