Page 9 - My FlipBook
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glossary
adapt—to change to fit different conditions
Cretaceous period—the last period of the Mesozoic era
that occurred between 145 million and 66 million years ago
evolve—to change slowly, often into a better, more complex state
extinct—no longer living
fossils—the remains of living things that lived long ago
Mesozoic era—a time in history in which dinosaurs lived
on Earth; the first birds, mammals, and flowering plants
appeared on Earth during the Mesozoic era.
packs—groups of the same animals; giganotosaurus may have
hunted in packs.
predator—an animal that hunts other animals for food
prey—animals hunted by other animals for food
serrated—having a sawlike edge
theropod—a meat-eating dinosaur that had two small arms
and moved on two legs
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