CK-12 Foundation
Ck 12: Life Science: Fertilization
[Free Registration/Login may be required to access all resource tools.] The sperm and egg don't look anything like a human baby. After they come together, they will develop into a human being. How does a single cell become a complex...
University of Manchester
Children's University of Manchester: Teeth and Eating: Tooth Timeline
Illustrated explanation of a basic change in humans as we grow: the maturing of our teeth.
PBS
Pbs: Nova: Fertility Throughout Life
This presentation compares & contrasts male and female fertility from pre-infancy through late adulthood.