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the water that is found underground in soil pore spaces and in the cracks and spaces within rock formations.
a genus of the Protozoa consisting of shapeless unicellular organisms that move by means...
substances that have a harmful effect on the environment and also on human health.
small fluid-filled spaces in the matrix of bone and cartilage in which cartilage and bone cells...
a strong ring of smooth muscle at the end of the pyloric canal which lets food pass from the...
a pattern of abnormalities found in babies born to mothers who drank excessive amounts of...