Polar bears are carnivores and prey on many arctic birds and fish. However, under natural conditions, no one found polar bears predating any penguin. This is because-

• A. Penguins have chemical substance in their muscles which is toxic to polar bears.
• B. Penguins are gregarious and always move in groups. Therefore, a polar bear cannot approach them
• C. Polar bears and penguins never coexist under natural conditions. The former lives in the North Pole while the latter lives in the South Pole.
• D. Polar bears and penguins display symbiotic relationships and they help each other for their existence in the ice-cold ecosystem.