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.