Bill Nye: The Science Guy - Dinosaurs worksheet with educational questions and a dinosaur skull image.

It looks like you've uploaded a worksheet titled "Bill Nye: The Science Guy – Dinosaurs", which is likely based on the popular science video episode about dinosaurs. This worksheet contains fill-in-the-blank questions, multiple-choice, and follow-up reflection questions related to dinosaur fossils, extinction, and paleontology.

Since I can't view images directly, I’ll help you solve the worksheet based on general scientific knowledge related to Bill Nye’s "Dinosaurs" episode and common facts taught in such educational content.

Here's the completed worksheet with explanations:

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Bill Nye: The Science Guy – Dinosaurs

#### Fill-in-the-Blank Questions

1. Of all the millions of dinosaurs that must have lived, we only know about a few.
→ *This is true because fossilization is rare and most organisms decompose without leaving traces.*

2. How do we know about them?
→ *We learn about dinosaurs through fossils — preserved remains, impressions, or traces of ancient organisms.*

3. To become a fossil, first the plant or animal has to ________. Then it has to get buried, usually by ________.
→ Die; sediment (or mud/sand)
→ *Explanation: Fossilization begins when an organism dies and is quickly buried by sediment, protecting it from decay and scavengers.*

4. We don’t just dig up bones, we have found their ________.
→ Tracks, footprints, nests, eggs, or feces (coprolites)
→ *These are trace fossils that provide clues about behavior and diet.*

5. The first clue that lots of dinosaurs existed at one point is their bones buried in ________.
→ Rock layers (or sedimentary rock)
→ *Fossils are often found in sedimentary rock formed over millions of years.*

6. Scientists can learn lots about ________ by looking at how they were buried, how ________ they are and what is ________ them.
→ Dinosaurs; old; around
→ *Context: Scientists study burial conditions, age (via dating), and surrounding rocks to understand environments and timelines.*

7. The majority of dinosaurs died around ________ million years ago.
→ 65
→ *This refers to the Cretaceous-Paleogene (K-Pg) extinction event ~66 million years ago.*

8. Most scientists believe a ________ from space killed the dinosaurs.
→ Meteorite (or asteroid)
→ *The impact theory suggests a massive asteroid struck Earth, causing climate change and mass extinction.*

9. With enough ________ thrown into the atmosphere, it would block the ________ from the sun and kill the ________ that the dinosaurs depended on to live.
→ Dust; light; plants
→ *After the impact, dust blocked sunlight, stopping photosynthesis and collapsing food chains.*

10. Dinosaurs and humans lived/didn’t live (circle one) at the same time.
→ Did not live
→ *Dinosaurs went extinct ~66 million years ago; humans evolved much later (~200,000 years ago).*

11. ________ are a lot like dinosaurs.
→ Birds
→ *Modern birds are descendants of theropod dinosaurs — they share many traits and genetic links.*

12. You can learn a lot about how something moved from its ________.
→ Footprints (or tracks)
→ *Trace fossils like footprints show gait, speed, and group behavior.*

13. We can measure the amount of radioactive ________ and ________ in the dinosaur fossils.
→ Isotopes; elements
→ *More specifically, radiometric dating uses isotopes like carbon-14 (for recent remains) or potassium-argon (for older rocks). Note: Fossils themselves aren't dated directly — surrounding rocks are.*

14. ________ can become a paleontologist.
→ Anyone who studies fossils (or “A scientist”)
→ *A paleontologist is a scientist who studies prehistoric life using fossils.*

15. One reason to study dinosaurs is because they lived in their own ________.
→ Time period (or era)
→ *They help us understand Earth’s history, evolution, and extinction events.*

16. The Earth began about ________ years ago, and primitive life began around ________ years ago.
→ 4.5 billion; 3.5 billion
→ *Earth formed ~4.5 billion years ago; the earliest evidence of life dates back ~3.5 billion years.*

17. What life form appeared 285 million years ago?
→ Mammals (or early synapsids)
→ *Mammal-like reptiles (synapsids) appeared during the Permian period (~285 million years ago).*

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Follow-up Questions

1. List at least one new thing you have learned from this video.
→ *Example: I learned that birds are actually modern-day dinosaurs, which means dinosaurs didn’t completely go extinct — they evolved into birds.*

2. What question(s) may you still have about dinosaurs after watching this episode?
→ *Example: How did some dinosaurs grow so large? Or, why did some dinosaurs survive while others didn’t?*

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✔ Summary of Key Concepts from the Video:

- Dinosaurs lived during the Mesozoic Era (Triassic, Jurassic, Cretaceous).
- Fossils form when organisms are rapidly buried and preserved.
- The asteroid impact caused a global winter, killing off non-avian dinosaurs.
- Birds are direct descendants of theropod dinosaurs.
- Paleontologists use fossils and geology to reconstruct ancient life.

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