Biology, Pages 58-67
Biology in clear, easy-to-read language
Biology is a comprehensive life science program for your reluctant readers and those who require additional help to grasp basic biological and life science concepts. This full-color, easy-to-read textbook addresses all these needs.
Written to meet national guidelines, students learn about classification and organization; patterns of reproduction, growth, and development; the human body's systems; ecological cycles; and other basic biological building blocks.
Lexile Level 840 Reading Level 3-4 Interest Level 6-12
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Proteins , DNA , carbohydrates , and other molecules that distinguish living
matter from inanimate material are all composed of carbon atoms bonded to one
another and to atoms of other elements . Hydrogen ( H ) , oxygen ( O ) , nitrogen (
N ) ...
Most organic compounds contain hydrogen atoms in addition to carbon atoms .
The overall percentages of the major elements of life - C , H , O , N , S , and P —
are quite uniform from one organism to another . Because of carbon's versatility ...
As you may recall from Chapter 2 , these models allow us to see the valences of
carbon and its most frequent partners — oxygen , hydrogen , and nitrogen . We
can think of these valences as the basis for the rules of covalent bonding in ...