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Solve the system. If the system has infinitely many solutions, write the solution set with x arbitrary.
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Preembryonic Development
The earliest phase of human development, from fertilization to the formation of the embryonic disc, which is before the actual embryo begins to form.
Morula
An early stage in embryonic development consisting of a solid ball of cells.
Endoderm
The innermost layer of cells or tissue of an embryo in early development, from which the digestive tract and associated structures develop.
Digestive Tract
The digestive tract is a series of hollow organs joined in a long, twisting tube from the mouth to the anus, where food is broken down into nutrients.
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