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the underground region which is saturated with ground water.
epithelial tissue consisting of a single layer of cells.
fats that are solid at room temperature and are found in animals. They are thought to be linked...
drugs that are used to treat infections caused by bacteria. Many antibiotics are produced by...
an artificial device that helps to stimulate and regulate the heart muscle.
membrane-bound compartments inside chloroplasts and cyanobacteria. They are the site of the...