The Mesozoic era was the Age of Reptiles, where reptiles like dinosaurs quickly became the dominant land animals due to developing shelled eggs. Gymnosperms also dominated as the prominent plant during this time. A major geological event was the breakup of the supercontinent Pangea. Many reptile groups went extinct at the end of the Mesozoic era.

1. 13.3 Mesozoic era: Age of
Reptiles

2. Dinosaur
• Land- dwelling reptile of the Mesozoic era

3. gymnosperm
• Seed- bearing plant that bears its seeds on the
surfaces of cones

4. Key Concept
• A major event of the Mesozoic era was the
breakup of Pangea.

5. Key Concept
• The gymnosperms quickly became the
dominant plants of the Mesozoic.

6. Key Concept
• With the perfection of the shelled egg,
reptiles quickly became the dominant land
animals.

7. Key Concept
• At the end of the Mesozoic, many reptile
groups became extinct.