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Website
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Purdue University: Virtual Library Developmental Biology

For Students 9th - 10th
A good resource for background into the entire scope of biological development. A list of terms will yield more depth on your choice.
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Unit Plan
CK-12 Foundation

Ck 12: Biology: Placental Mammals

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Describes how reproduction takes place in placental mammals.