General Biology · free preview
Chapter 27: Introduction to Animal Diversity
Animal evolution began in the ocean over 600 million years ago with tiny creatures that probably do not resemble any living organism today.
1. Chapter 27: Introduction to Animal Diversity
Chapter 27: Introduction to Animal Diversity
2. Key terms check
Which key term matches this definition?
animal without a body cavity
3. Key terms check
Which key term matches this definition?
type of symmetry in which there is only one plane of symmetry, so the left and right halves of an animal are mirror images
4. Key terms check
Which key term matches this definition?
opening into the archenteron that forms during gastrulation
5. Key terms check
Which key term matches this definition?
16–32 cell stage of development of an animal embryo
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