Discussion
The secretion of the preen gland is possessed by the birds to ______________.
Answer: D
The preen gland's secretion is used to dress and waterproof the plumage. The passage says the secretion is about one-half lipids (fats and oils) and is probably important in dressing and waterproofing the plumage.
The passage does not link the secretion to preventing heat loss, to making flight easier, or to raising or lowering feathers.
The passage links the secretion to dressing and waterproofing the plumage, and it notes that in a few birds the secretion has a strong offensive odour, which is a separate point. The other options describe functions that the passage does not mention at all.
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