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Students use a prediction guide to surface prior knowledge on sexual reproduction across different species.

Commonalities in embryo development across vertebrates highlight evolutionary relationships and provide evidence for common descent. Human reproduction is highlighted in this sequence, and students explore the role of the placenta and how toxins may impact development.

An index of multimedia and text resources that can be used to support students in investigating the similarities and differences between eggs of different species and the role meiosis plays in sexual reproduction.

Different plant and animal species employ different strategies for reproducing sexually. One key area where these differences are observable is in their method of gamete production and their fertilization methods. In this sequence, students compare different species' gamete production and fertilization methods to those of humans; allowing them to consider the reproduction advantage of different methods.

Reproduction and development are necessary for the continuation of any species, and as such all species have unique but related strategies for reproduction. In this unit, students learn about continuity and diversity of life in a variety organisms, including humans, and use their findings to discern evolutionary relationships. Exploring print texts, visuals, and hands-on experiences, students compare the mechanisms through which different living things reproduce, with a focus on comparisons to human reproduction.