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Understanding Amniotes: The Evolution of Vertebrates Adapting to Dry Environments

This lecture explores the evolution of amniotes, the first vertebrates to adapt to dry habitats. These unique organisms produce eggs with four protective membranes, which help conserve water and safeguard the developing embryo before hatching. Amniotes possess dry, tough, or scaly skin and lead active lifestyles. This group is divided into two major branches: synapsids, which include mammals and their extinct relatives, and sauropsids, encompassing reptiles and birds. Discover how these adaptations have shaped the success of vertebrate life on land.

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Understanding Amniotes: The Evolution of Vertebrates Adapting to Dry Environments

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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. Amniotes • The first invertebrates to adapt to dry habitats. • The only vertebrates that produce eggs with four membranes: • these membranes conserve water; protect the developing embryo before hatching or being born. • Have dry, tough or scaly skin. • Active lifestyles

  3. Two Major Groups of Amniotes • Synapsids (the early branches) • mammals and their extinct relatives • Sauropsids • reptiles and birds.

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