Explore the biodiversity of the Class Amphibia through videos, photos and examples. [2:34]
Discover what evolution is through a case study of a Hawaiian snail species' survival. [7:20]
Learn about the scientific hypotheses of the origin of life on Earth. [5:55]
Learn about the Earth's evolutionary history during the Cambrian period. [3:25]
Learn about what a fossil is, the different types that scientists use for study, and processes that form them. [2:57]
Learn about the evolutionary process of sexual selection, a specific form of natural selection. [12:09]
Learn about the contributions of Gregor Mendel to genetics. [1:21]
Read and watch how the blood, the heart, and the blood vessels keep the blood flowing through our bodies. [6:00]
Learn the different hormones plant and how plants use them for growth and development. [2:39]
Make learning about Earth's biomes fun and easy with video clips, photographs, and diagrams. Learn about estuaries, the water environments formed where freshwater from rivers or streams mix salt ocean water. [6:38]
Learn about the flora and fauna of the intertidal aquatic zone and the characteristics that describe this aquatic biome through reading and watching video clips. [6:42]
Learn about the three types of muscle tissue, how a muscle contracts, and how muscles are adapted for exercise. [3:40]