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Name ________________________ due date ________ period ______ WKST: EVOLUTION AND GEOLOGIC TIME Use the words in the box to fill in the blanks in the statements. adapted epochs geologic time scale 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. continents eras natural selection environment fossils evolution extinct plate tectonics periods species The division of Earth’s history into units makes up the _____________________. Major divisions of Earth’s history are _____________________. Each major division may be divided into _____________________. The Cenozoic Era is divided into _____________________. Clues to which organisms lived in different eras are found in _____________________. A gradual change in life-forms over time is _____________________. Each change in Earth created different surroundings for organisms, these surroundings are called their _____________________. A group of organisms that normally reproduce among themselves is a _____________________. After major changes in Earth’s environments, species either died out or _____________________. Species that could not adapt to changes eventually became _____________________. Organisms with traits that are suited to an environment survive by the process of __________________. At different times in Earth’s history, plate tectonics caused collision and separation of ______________. Many species adapted or became extinct because _____________________ caused their environments to change when the continents collided or separated. List the events and types of organisms in the box in the order in which they appeared on Earth. The oldest one is Number 1. amphibians complex organisms cyanobacteria Pangaea organisms with hard parts fish invertebrates reptiles shielding of Earth from ultraviolet rays oxygen and ozone layer 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ _____________________________________________ 11. Which of the events in the list occurred in the Precambrian time? ________________________________ 12. Why is so little known about the Precambrian time? ___________________________________________ ___________________________________________________________________________________ 13. What are some differences between amphibians and reptiles?____________________________________ ___________________________________________________________________________________ 14. What might have caused the mass extinctions of many land and sea animals at the end of the Paleozoic Era?_______________________________________________________________________________ ___________________________________________________________________________________