Examlex
The chorion develops from the blastocyst to become an important fetal membrane of the placenta.
Limestone
A sedimentary rock composed mainly of calcium carbonate, often used in construction and as a raw material in cement production.
Aquifer
An underground layer of water-bearing permeable rock, rock fractures, or unconsolidated materials (gravel, sand, or silt) from which groundwater can be extracted using a water well.
South Dakota
A state located in the Midwestern region of the United States, known for landmarks like Mount Rushmore.
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