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What was Darwin's main purpose during his time aboard the H.M.S. Beagle?
Submucosa
Layer of tissue in the digestive tract lying just beneath the mucosa, containing blood vessels, nerves, and glands.
Serosa
Another term for serous membrane, the smooth tissue lining certain internal cavities of the body.
Chyme
The semi-fluid mass of partly digested food that moves from the stomach to the small intestine.
Enamel
The hard, protective outer layer of the tooth, made primarily of minerals and the hardest material in the human body.
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