Unit Plan
CK-12 Foundation

Ck 12: Biology: Immunity

For Students 9th - 10th
[Free Registration/Login may be required to access all resource tools.] Discusses immunity and the differences between active and passive immunity.
Activity
PBS

Pbs: Never Say Die: The Clock of Life

For Students 9th - 10th
This site from the PBS production, Scientific American Frontier "Never Say Die", includes a section entitled "The Clock of Life". It provides a discussion of cell death through shortening of the telomere. A good class activity included.