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:
P S R Q
Q S R P
P R Q S
R Q P S
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