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GILL LIFE HISTORY

Page history last edited by wikiuser0006 13 years, 11 months ago

Start it up!

notes on cloning

notes on DNA engineering

quiz-cloning

 

 

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1. Has life always existed on Earth? How would you know?

 

 

2. Do you know how old the Earth is?

 

 

3. Were all the organisms present in today's Earth were the same when the Earth started supporting life?

 

 

4. What type of rocks hold clues to Earth's past life forms?

 

 

5. Cut out the milestones in Earth's life history and affix in appropriate time line in Earth's history shown below. Add some events that you find interesting.

1. Single cells are found in sedimentary rock (bacteria -like cells)

2. Humans fossils are found dating to this period

3. No evidence of life as we know it

4. First evidence of cells present in environment (stromatolites)

5. Permian extinction: nearly 95% of marine-life, 65% of amhibians, 30% of insects died out

6. Rise of reptiles like dinosaurs

7. Extinction of many forms of reptiles like the dinosaurs

8. Rise of mammals

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

6. Cut the pictures of past and present life forms and attach the the timeline below in appropriate time periods.

           

 

 

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