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Discuss how classification systems have ...

Discuss how classification systems have undergone several changes over a period of time ? 

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Changes in classification system over a period of time, more criteria for classification were implemented based on observable morphological features.
These criteria are habitat, cell structure, nature of cell wall when present, mode of nutrition and reproduction, evolutionary relationships.
Prokaryotes have been kept as separate kingdom called Monera.
Eukaryotes (single-celled) have been separated in kingdom - Protista.
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