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Chapter 3
Organisms of Long Ago
Reviewing Vocabulary:
• 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.
Ancestor Endangered species eraExtinct species Fossil paleontologistRelative species trait
Reviewing Vocabulary:
• 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 ____________________.
Ancestor Endangered species eraExtinct species Fossil paleontologistRelative species trait
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 Erahttps://www-k6.thinkcentral.com/content/hsp/science/hspscience/tn/gr3/se_9780153832376_/index.html?yup=1&online=true
11. Name two human activities that might cause a species to
become extinct. – ___________________________– ___________________________
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: Fossils of Existing Animals:
Can be formed from: Can be formed from: Provide clues about: Provide clues about:
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 100-103– **think of what endangered means and what
extinct means.
• 19. A magazine article tells about an extinct ancestor of modern lions. What are some traits the extinct ancestor might have?– Look at pages 118-121.– ** 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.
• 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.
24. Which is most likely the kind of evidence that helped scientists learn that saber-toothed cats once lived? A. leaf imprintsB. fossil bones and teethC. shell imprintD. fish scale fossils.
• 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 imprintsB. fossil bones and teethC. shell imprintD. 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 100-101.
• 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.