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Performance standards are criteria that specify the expected quality or level of student learning.
Yolk Sac
The sac that holds the materials for the nutrition of the embryo.
Mesoderm
The middle layer of an embryo in early development, which will eventually give rise to the muscles, bones, and circulatory system.
Umbilical Cord
The rope-like connection between the fetus and the placenta. It contains the umbilical blood vessels.
Breast Cancer
A malignant tumor that develops from breast cells and is the most common cancer affecting women worldwide.
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