Across
- 2. Over millions of years, giraffes developed longer necks so they could reach higher leaves for food.
- 3. Scientists are working on ways to bring back extinct animals like the woolly mammoth using preserved DNA.
- 5. A scientist tests a rock in a lab and measures radioactive decay to determine it is millions of years old.
- 8. The field of science that focuses on studying fossils like dinosaur bones and ancient plants.
- 11. A scientist who carefully digs in the desert to uncover dinosaur bones and study ancient life.
- 12. A giant asteroid hits Earth, causing many species, including the dinosaurs, to disappear in a short time.
- 13. Dinosaurs lived during a specific long stretch of Earth’s history called the Mesozoic, which is a subdivision of an even larger time period.
- 14. A scientist finds a certain type of trilobite fossil in a rock layer and uses it to figure out how old that rock is.
- 15. A chick growing inside an egg before it hatches is in an early stage of development.
Down
- 1. Scientists study layers of fossils in rocks to see how life on Earth has changed over time.
- 4. Humans and chimpanzees share a species from long ago that both evolved from.
- 6. A student studies the bones and organs inside the human body during a biology class.
- 7. A frog starts as an egg, then becomes a tadpole, and slowly develops into an adult frog.
- 9. A geologist looks at layers of rock and decides which ones are older or younger based on their position.
- 10. A fossil found deeper in the ground is considered older than one found closer to the surface.