| A | B |
|---|
| angiosperm | flowering plant that produces seeds within a fruit |
| dinosaur | land-dwelling reptile of the Mesozoic era |
| Gondwana | late Paleozoic continent that formed the southern portion of Pangaea, consisting of all or parts of present-day South America, Africa, Australia, India, and Antarctica |
| gymnosperm | seed-bearing plant that bears its seeds on the surfaces of cones |
| Laurasia | the continental mass that formed the northern portion of Pangaea, consisting of present-day North America and Eurasia |
| mammal | animal that bears live young and maintains a steady body temperature |
| Pangaea | the proposed supercontinent that 200 million years ago began to break apart and form the present landmasses |
| shield | A large, relatively flat expanse of ancient metamorphic rock within the stable continental interior |
| stromatolite | structure produced by algae trapping sediment and forming layered mounds of calcium carbonate |
