In the Antarctic, plankton—tiny one-celled plants and animals—is the basis for all life. The smallest fishes subsist on it, and they in turn become the food of larger fish, which are eaten by squids and seals and penguins, who constitute the food for killer whales, sea leopards, and giant sperm whales. The cycle of life begins with plankton, and when it is present, the other creatures of the Antarctic are never far behind. Five
Life in Antarctica.
