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large spongy organs in which gaseous exchange takes place in vertebrates (with the exception of...

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goods that are desirable; but not essential for everyday life.

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the fluid that circulates through the lymphatic system. It is similar to blood plasma in...

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a connected network of vessels and glands, which carry lymph throughout the body.

the word lyric comes from lyre, a stringed musical instrument. It therefore originally meant a...

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