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Viruses are characterized by type of nucleic acid, structure of viral protein coat, mode of entry into host cell, and replication mechanisms B. number of capromeres
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The number of processes extending from their cell body. Neurons are grouped structurally according to the number of processes extending from their cell body.
http://wiki.answers.com/Q/Which_criterion_is_used_...
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He used their form and structure. Each category represent a level of grouping.
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The molecule contains one or more carbon atom.
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