CK-12 Foundation
Ck 12: Life Science: 2.3 Cell Theory
Learn about the cell theory and levels of organization in a multicellular organism.
Famous Scientists
Famous Scientists: Theodor Schwann
Learn about German Physiologist, Theodor Schwann, one of the scientists who helped develop the cell theory.
CK-12 Foundation
Ck 12: Earth Science: Wegener and the Continental Drift Hypothesis
[Free Registration/Login may be required to access all resource tools.] How Wegener's hypothesis of continental drift was refined.
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