Explorations Through Time
Life Has a History

http://www.ucmp.berkeley.edu/education/explotime.html ' Go to "Life Has a History" ' Level 2

1. How many different species of living things exist today? ___________________
2. Which group of animals has the largest number of species? _______________________
3. How many mammal species exist today? ______________
4. Number the organisms from 1 (most abundant) to 8 (least abundant)
___Plants ___ Protists ____ Mammals ____ Molluscs
___ Fungi ___ Roundworms ____ Arthropods ____ Flatworms

5. What is biodiversity (click on the purple links for definitions)
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6. 470 Million Years Ago
What was the name of the period? ________________________
What was the dominant predatory? ____________________________
What was the first arthropod
7. 160 Million Years Ago
What was the name of the period? _____________________________
What large marine reptile existed? _____________________________
8. How old is the earth? _____________________________
9. Fill in the blanks of the timeline

10. The best source of evidence for determining events in earth's history is ______________
11. What is a paleontologist? ____________________________________________

12. Identify three fossils from the image. Name them and point to them with an arrow
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13. What features are found in therapods
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14. What is a cladogram?
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15. What is divergence?
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16. To which animal are the crane and eagle most closely related? _______________________
17. What other data (besides physical features) do scientists use to find if organisms are related? List 3 things. ___________________________________________________________
18. What birds on the Galapagos islands were adapted to different regions? ________________
19. The beaks of the birds vary with what? __________________________________________
20. What would happen if the environment changed and only plants with larger, harder seeds survived.How do you think that might affect the population of Geospiza fortis finches?
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21. What is geographic isolation? _______________________________________________________
22. Identify the extinct creature. ______________________________________________

23. Name two animals that have gone extinct since humans have been around. ______________________________________________