1. Chapter 3
Organisms of Long Ago

2. Reviewing Vocabulary:
Ancestor Endangered species era
Extinct species Fossil paleontologist
Relative species trait
A species or form of species that lived long ago and to which modern species may be traced back is a/an __________________.
The preserved remains of an organism is a/an_______________________.
A scientist who studies fossils is a ________________________.
A species that shares a common ancestor and has many traits in common with another species is a/an ______________ of that species.

3. Reviewing Vocabulary:
Ancestor Endangered species era
Extinct species Fossil paleontologist
Relative species trait
A group of the same type of living thing that can mate and produce living things of the same kind is a/an _________________.
A major division of time is a/an __________________.
A species that is at risk of dying out is a/an ____________________.
A feature, such as a body part or behavior, is a/an ___________________.
A species that has died off is called a/an ____________________.

4. Inquiry Skills (Reading a timeline and Hypothesizing)
10. In your textbook on page 110, look at the geologic Time scale. An extinct organism lived 300 million years ago. Which era did it live in?
Mesorzoic Era
Paleozoic Era
Cenozoic Era
11. Name two human activities that might cause a species to become extinct.
___________________________

5. Map the Concept: (using a graphic organizer)
Use the terms from the list to fill in the concept map.
Behavior relatives
Bones shells
Food sources teeth
Fossils of Existing Animals:
Can be formed from:
Provide clues about:

6. Critical Thinking (Applying, Analyzing, Evaluating)
18. Because of overhunting, the number of species of birds drops from 75 to 10. Is this species endangered or extinct? Explain.
Look at pages
**think of what endangered means and what extinct means.

7. 19. A magazine article tells about an extinct ancestor of modern lions
19. A magazine article tells about an extinct ancestor of modern lions. What are some traits the extinct ancestor might have?
Look at pages
** think of what extinct means and what an ancestor is.
** think about the Vinn diagram we made comparing an elephant to its ancestor.  
20. Suppose a fossil is found on a mountain. The animal that formed the fossil has fins, a tail, and a flat body. What evidence is there to support the idea that the mountain was once under the ocean? Explain.

8. 22. The modern elephant and its ancestors: a. share no traits.
21. What might people do to save a species that is endangered because of destruction of its habitat?
Look at page 104.  
22. The modern elephant and its ancestors:
a. share no traits.
b. share some traits
c. share all traits
d. are not related.

9. 23. Which of the following would a paleontologist most likely study?
a. why tigers have become endangered.
b. whether dinosaurs are related to birds.
c. how fish breathe with gills
d. what modern wolves eat.
24. Which is most likely the kind of evidence that helped scientists learn that saber-toothed cats once lived? A. leaf imprints B. fossil bones and teeth C. shell imprint D. fish scale fossils.

10. B. fossil bones and teeth C. shell imprint D. fish scale fossils.
24, Which is most likely the kind of evidence that helped scientists learn that saber-toothed cats once lived?
A. leaf imprints
B. fossil bones and teeth
C. shell imprint
D. fish scale fossils.
25. What do most scientists believe caused the extinction of dinosaurs?
Look at page 100 
26. What natural events can cause a species to become extinct?
Look at pages

11. 29. True or false: paleontologists find the age of fossils in one way.
27. Name the differences between endangered species and extinct animals.
Pages 100—104
28. True or false: Does a fossil provide complete information about the organism that formed it?
Look at pages 108—109.
29. True or false: paleontologists find the age of fossils in one way.
Look at page 110.
30. True or false: modern species can look similar to extinct species.
Look at page 120.