(B) Penguins are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere,with the largest populations found in An

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(B) Penguins are a group of aquatic flightless birds. They live almost exclusively in the Southern Hemisphere,with the largest populations found in Antarctica. They are highly adapted for life in the water,possessing flippers for swimming and a thick layer of blubber for insulation against the extreme cold of the Antarctic environment.