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This activity guides the analysis of a published scientific figure from a study that compared the testosterone levels of Olympic-level elite athletes.

This activity explores images of planarians regenerating missing body parts, which serve as phenomena for learning about cell division and differentiation.

This short video explores how a baby’s microbiome is established during birth.

This video describes how scientists silence different genes in regenerating planaria to study the process of regeneration at the molecular level.

This activity explores an image of early embryonic cells, which serves as a phenomenon for learning about cell division and development.

This animation shows how a region of the brain called the cerebral cortex develops in a human fetus.

This animation tracks how the human brain develops over nine months of gestation.

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

This activity allows students to observe their own planarian and then design an experiment to investigate how planarians regenerate. It supports viewing of the video Identifying Key Genes in Regeneration.

This animation gives an overview of how a fertilized human egg develops into an embryo.

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

This animation shows how somatic cell nuclear transfer (SCNT) creates an embryo from an egg cell and a body cell.