27: Introduction to Animal Diversity Last updated Mar 6, 2021 Save as PDF 26.4C: Biodiversity of Plants 27.1: Features of the Animal Kingdom Page ID12615 BoundlessBoundless ( \newcommand{\kernel}{\mathrm{null}\,}\) Topic hierarchy27.1: Features of the Animal Kingdom27.1A: Characteristics of the Animal Kingdom27.1B: Complex Tissue Structure27.1C: Animal Reproduction and Development27.2: Features Used to Classify Animals27.2A: Animal Characterization Based on Body Symmetry27.2B: Animal Characterization Based on Features of Embryological Development27.3: Animal Phylogeny27.3A: Constructing an Animal Phylogenetic Tree27.3B: Molecular Analyses and Modern Phylogenetic Trees27.4: The Evolutionary History of the Animal Kingdom27.4A: Pre-Cambrian Animal Life27.4B: The Cambrian Explosion of Animal Life27.4C: Post-Cambrian Evolution and Mass Extinctions