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Many fossil diatoms are known, because the siliceous skeleton of the wall (Figure 26.6) is practically indestructible, and as diatoms are one of the major groups of algae in the Oceans, large fossil deposits of diatom walls have accumulated in many areas. These deposits, known as ''diatomaceous Earth'', have industrial uses as abrasives and filtering agents.
 
Many fossil diatoms are known, because the siliceous skeleton of the wall (Figure 26.6) is practically indestructible, and as diatoms are one of the major groups of algae in the Oceans, large fossil deposits of diatom walls have accumulated in many areas. These deposits, known as ''diatomaceous Earth'', have industrial uses as abrasives and filtering agents.
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== The Major Groups of Algae temp==
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The main distinctions are based upon the inclusion or not of three types of chlorophylls, special carotenoids and phycobilins; composition of the cellulosic Cell wall (nay, yay and double - and with or without algin); and the Nature of reserve materials (be they starch, paramylum and fats, starch and oils, leucosin and oils, or laminarin and fats); the number and types of Flagella - be there generally two identical flagella per Cell, one two or three flagella per Cell, two flagella dissimilar in form and position on Cell, two flagella arrangement variable, two flagella of unequal length, or none;  and Range of Structure - includes Unicellular, coenocytic, filamentous, and Plantlike Multicellular Forms.
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From Table 26.1.
      
== The Natural Distribution of Algae ==
 
== The Natural Distribution of Algae ==
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