At approximately 22 weeks, a fetus becomes fully covered by lanugo, or a fine, soft hair that insulates the body until fat deposits accumulate in the wrinkles of the skin, often remaining until birth.
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Aa fine, soft hair that insulates the body until fat deposits accumulate in the wrinkles of the skin, often remaining
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Bfine, soft hair insulating the body until the accumulation of fat deposits in the wrinkles of the skin, and these often remain
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Cfine, soft hair that insulates the body until the accumulation of fat deposits in the wrinkles of skin that often remain
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Da fine, soft hair, which insulates the body until fat deposits accumulate in the wrinkles of the skin, and which often remain
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Efine, soft hair, which insulates the body until an accumulation of fat deposits in the wrinkles of the skin, which often remains
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正确答案: A