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Blue-green algae are placed in the kingd...

Blue-green algae are placed in the kingdom

A

Plantae

B

Protista

C

Fungi

D

Monera.

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**Step-by-Step Solution:** 1. **Understanding Blue-Green Algae**: Blue-green algae are scientifically known as cyanobacteria. They are photosynthetic organisms that can be found in various aquatic environments. 2. **Classification System**: The classification of living organisms has evolved over time. One widely accepted system is the five-kingdom classification proposed by R.H. Whittaker. This system categorizes life into five kingdoms: Monera, Protista, Fungi, Plantae, and Animalia. 3. **Characteristics of Cyanobacteria**: Cyanobacteria are unicellular organisms that lack a well-defined nucleus. This means they are prokaryotic, which is a key characteristic that differentiates them from eukaryotic organisms. 4. **Placement in the Kingdom**: Given that cyanobacteria are prokaryotic and unicellular, they fit the criteria for the kingdom Monera. Monera includes all prokaryotic organisms, which are characterized by the absence of a true nucleus. 5. **Conclusion**: Based on the characteristics of cyanobacteria and the classification system, blue-green algae (cyanobacteria) are placed in the kingdom Monera. **Final Answer**: Blue-green algae are placed in the kingdom Monera. ---
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