in Diversity of Living Organisms by

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  1. Class is a taxonomic category between division and order.
  2. It is a group of closely related orders.
  3. It generally ends with the suffix ‘ae’.
  4. When a class is larger, it is divided into sub-classes (polypetalae, gamopetalae) which are further sub-divided into series.
  5. In the class, organisms are least similar to one another.