Optional Activities
Additional Activities
- Amniotic Egg Model: The amniotic egg was one of evolution’s most important inventions, it let vertebrates reproduce on dry land without returning to water. Using a hard-boiled egg, label each layer: shell (protection), albumen/white (cushioning), yolk (food), and air cell (oxygen reserve). Connect each to its survival function.
- Reptile vs Mammal Compare Chart: Make a T-chart listing key differences: scales vs hair, cold-blooded vs warm-blooded, few large eggs vs many small or live births, simpler vs complex teeth, smaller vs larger brain. Then ask: which traits came FIRST? The mammal-like reptiles (therapsids) of this lesson had some of each column.
- Synapsid Timeline: Synapsids (mammal-like reptiles) dominated the Permian but mostly vanished in the Great Dying. A few survived to become the first true mammals in the Triassic. Research the synapsid-to-mammal transition: what features appeared step by step? The jaw joint is one of the most fascinating, three bones that were jaw bones in reptiles became the tiny hammer, anvil, and stirrup bones in your inner ear.
- Convergent Evolution Gallery: Mammals and reptiles evolved similar solutions to the same problems independently, many times. Research three examples of convergent evolution between the two groups (e.g., dolphin vs ichthyosaur body shape; mole vs blind lizard digging adaptations; flying squirrel vs flying lizard gliding). What does convergence tell us about how evolution works.