Invertebrates  

Invertebrates guides students through an investigation of the majority of Earth’s animal phyla. In this overview of the animals without backbones, students gain an understanding of the evolutionary relationships between organisms by following trends in increasing complexity in body plans and levels of organization. Important details in animal development and categorization are reinforced as students tour the phyla, examining differences in development and organization as well as ways in which the various types of animals survive and reproduce to create new generations.

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