Polar Bears Are Threatened by a Reduction in the Amount

question 8

Multiple Choice

Polar bears are threatened by a reduction in the amount of phytoplankton in the ocean because

• A)polar bears are at the top of the food chain in which phytoplankton are the primary producers.
• B)polar bears use phytoplankton as an important source of vitamins.
• C)phytoplankton are bioindicators of the amount of ice in the polar bear's ecosystem.
• D)polar bears become covered with phytoplankton as camouflage when they forage on the tundra.

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