S₁: Great quantities of animal oil come from whales.

S₆: A few other creatures also yield oil.

P: It produces a great quantity of oil which can be made into food for human consumption.

Q: These enormous creatures of the sea are the largest remaining animals in the world.

R: When the whale is killed, the blubber is stripped off and boiled down.

S: To protect the whales from the cold of the Arctic seas, nature has provided it with a thick covering of fat called blubber.

The proper sequence should be:

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