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Worksheets and No Prep Teaching Resources
Reading Comprehension Worksheets
Life Science
The Beginning of Life on Earth

Life Science
Life Science


The Beginning of Life on Earth
Print The Beginning of Life on Earth Reading Comprehension with Sixth Grade Work

Print The Beginning of Life on Earth Reading Comprehension


Reading Level
     edHelper's suggested reading level:   high interest, readability grades 6 to 8
     Flesch-Kincaid grade level:   5.77

Vocabulary
     challenging words:    eukaryote, eukaryotes, globbed, many-celled, prokaryotes, methane, characteristic, hydrothermal, heated, reproduce, billion, nucleus, atmospheric, hydrogen, magma, theory
     content words:    Monera Kingdom


The Beginning of Life on Earth
By Patti Hutchison
  

1     When did life begin on earth? We know it did not begin when the earth was formed 4.6 billion years ago. The earth was constantly being struck by meteorites at that time. Also, there was no oxygen in the air. The first fossils of life were formed about 3.5 billion years ago. This makes scientists believe the first life began between 3.9 and 3.5 billion years ago.
 
2     Scientists believe that a kind of atmospheric "soup" of hydrogen, ammonia, and methane reacted when lightning struck them. They formed the building blocks of life. These building blocks are called amino acids. They form proteins. Proteins are the basic substances of living things.
 
3     Proteins were the first step. Other substances needed are DNA and RNA. These substances allow living things to reproduce. This is a basic characteristic of living things.
 
4     DNA carries the instructions for cell function. RNA can act as an enzyme that also helps cells function.

Paragraphs 5 to 11:
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Life Science
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    Careers in Science  
 
    Caring for Earth  
 
    Clouds  
 
    Dinosaurs  
 
    Earth's Land  
 
    Earth  
 
    Earthquakes  
 
    Electricity  
 
    Energy  
 
    Erosion  
 
    Food Pyramid  
 
    Food Webs and Food Chain  
 
    Forces and Motion  
 
    Fossils  
 
    Health and Nutrition  
 
    How Things Work  
 
    Landforms  
 
    Life Science  
 
    Light  
 
    Magnets  
 
    Matter  
 
 
    Moon  
 
    Natural Disasters  
 
    Photosynthesis  
 
    Plant and Animal Cells  
 
    Plants  
 
    Rocks and Minerals  
 
    Science Process Skills  
 
    Scientific Notation  
 
    Seasons  
 
    Simple Machines  
 
    Soil  
 
    Solar System  
 
    Sound  
 
    Space and Stars  
 
    Sun  
 
    Tsunami  
 
    Volcanoes  
 
    Water Cycle  
 
    Water  
 
    Weather  
 



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