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How long will it take for two grams of cesium-137 to decay to one milligram? (t1/2 = 30.1 years)
Watery Sac
A fluid-filled bladder or cyst that can form in various parts of the body, often benign.
Primitive Streak
Ectodermal ridge in the midline of the embryonic disk, from which arises the mesoderm by the inward and then lateral migration of cells.
Epiblast Cells
Cells in the early embryo that give rise to the tissues of the body.
Mesoderm
Middle of the three germ layers of an embryo.
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