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This animation illustrates the main stages of the water cycle in Gorongosa National Park, an ecosystem that experiences both wet and dry seasons.

This video provides an overview of the types of genes that, when mutated, can lead to the development of cancer.

This animation shows how disrupting cellular processes in the intestines can lead to colon cancer.

This animation shows how varying concentrations of a signaling molecule activate different transcription factors to determine cell fate.

This animation shows how stem cells from early mammalian embryos can be grown and studied in a laboratory.

This animation describes the formation and fates of the three germ layers in a human embryo.

This animation shows how salamanders can replace missing limb tissues with the help of cells similar to stem cells.

This animation shows how a tumor forms, recruits blood vessels, and enters metastasis.

This animation shows how tumors use the protein VEGF to recruit blood vessels.

This animation shows how meiosis, the form of cell division unique to egg and sperm production, can give rise to sperm that carry either an X or a Y chromosome.

This animation shows how recombination occurs between the X and Y chromosomes, then within the Y chromosome itself.