The diversity of invertebrates

In this topic

• Who are the invertebrates?
• Single-celled animals and cnidarians
• Three kinds of worm, and the body cavity
• Molluscs and arthropods

Key terms

• Invertebrates
• Radial symmetry
• Bilateral symmetry
• Stinging cell
• Gastric cavity
• Coelom
• Closed circulatory system
• Mantle
• Shell
• Moulting
• Trachea
• Parasite

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