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Stem Cells Without Creating Embryos (0:59)

Watch this Reuters video about a new advance in stem cell technology. University of Wisconsin scientists have turned normal skin cells into batches of cells that function similar to embryonic stem cells, and all without cloning or making embryos.

Stem Cells Without Using Embryos (1:29)

Watch this Reuters video to see how scientists have created human stem cells without using live embryos. More specifically, scientists have turned ordinary human skin cells into batches of cells that act and look like embryonic stem cells.

The Living Cell: Mitochondria (1:32)

Through cellular respiration, mitochondria produce energy for cells.

Understanding Cells: How Cells Reproduce - Video Quiz (1:22)

Check out this video for a brief quiz on cellular reproduction.

Understanding Cells: How Cells Work - Video Quiz (2:24)

Check out this video for a brief quiz on organelles and cell function.

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Animal Communities: Review (3:30)

This video provides a review of the "Animal Communities" video series.

Animal Communities: Food Niches (1:56)

A niche is the role that an organism plays in its habitat. Food chains describe the feeding relationship among organisms.

Genetics and Heredity: Mutation (2:30)

A change in the DNA of a gene is a mutation. Beneficial mutations are passed on to succeeding generations. Negative mutations may affect an individual's ability to survive and reproduce, so that the mutation will die with that individual.