Evolution of body coverings and the musculoskeletal system

In this topic

• Why does the body need a covering?
• How coverings became more complex in invertebrates
• Chordate skin: from fish to mammal
• Three kinds of skeleton, and muscles

Key terms

• Cuticle
• Chitin
• Moulting
• Epidermis
• Dermis
• Keratin
• Hydrostatic skeleton
• Exoskeleton
• Endoskeleton
• Notochord
• Pentadactyl limb
• Diaphragm

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