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Key Adaptations of Arthropods: Evolutionary Success Factors

This lecture explores six critical adaptations that have contributed to the evolutionary success of arthropods. Key features include the development of a hardened exoskeleton for protection and water retention, jointed appendages that enhance movement and functionality, and specialized, modified body segments that allow for diverse forms and functions. Additionally, unique respiratory structures facilitate efficient gas exchange, while advanced sensory organs enhance environmental interaction. Finally, specialized developmental stages contribute to the life cycle and survival strategies of these invertebrates.

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Key Adaptations of Arthropods: Evolutionary Success Factors

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  1. Lecture 5Animal Evolution – The Invertebrates

  2. 6 important adaptations that contributed to the success of arthropods: • hardened exoskeleton • joint appendages • highly modified & specialized segments • respiratory structures • specialized sensory structures • specialized developmental stages.

  3. i. Hardened exoskeleton • cuticle made of chitin, proteins & waxes with calcium carbonate deposits. • Cuticle; a protective external skeleton (exoskeleton). • cuticle could have evolved to escape predation. • waxy surface limits water loss. • hard cuticles restrict size increases; arthropods grow in spurts by molting.

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