British zoologist Thomas Cavalier-Smith proposed 7 kingdom classification.

**Who Proposed the 7 Kingdom Classification?**

The 7 Kingdom Classification was proposed by Carl Woese, an American microbiologist and biophysicist, in the 1970s. Woese revolutionized our understanding of the diversity of life forms through his groundbreaking work on the classification of organisms based on their evolutionary relationships.

**Explanation of the 7 Kingdom Classification**

The traditional classification system initially divided all living organisms into two broad groups: plants and animals. However, Woese's research challenged this simplistic classification and revealed a more complex and accurate picture of the diversity of life on Earth. He proposed a new classification system that included seven kingdoms, each representing distinct groups of organisms.

1. **Kingdom Monera**: This kingdom encompasses prokaryotic organisms, which lack a nucleus and membrane-bound organelles. Bacteria and cyanobacteria (blue-green algae) are classified under this kingdom.

2. **Kingdom Protista**: The protists are eukaryotic organisms that do not fit into the plant, animal, or fungi kingdoms. They are mostly unicellular, although some multicellular protists exist. Examples include amoebas, algae, and protozoans.

3. **Kingdom Fungi**: Fungi are eukaryotic organisms that obtain nutrients by absorbing them from their surroundings. They include mushrooms, yeasts, molds, and mildews.

4. **Kingdom Plantae**: This kingdom consists of multicellular, eukaryotic organisms capable of photosynthesis. Plants are characterized by their ability to produce their own food using sunlight, water, and carbon dioxide.

5. **Kingdom Animalia**: Animals are multicellular, eukaryotic organisms that are heterotrophic, meaning they obtain their nutrients by consuming other organisms. This kingdom includes a vast array of creatures, ranging from insects and fish to mammals and humans.

6. **Kingdom Archaea**: Archaea are prokaryotic microorganisms that often inhabit extreme environments such as hot springs, deep-sea hydrothermal vents, and salt lakes. They are distinct from bacteria and share some characteristics with both bacteria and eukaryotes.

7. **Kingdom Chromista**: This kingdom consists of eukaryotic organisms that possess chlorophyll and other pigments. It includes various algae and other protists.

These seven kingdoms provide a more comprehensive and accurate framework for classifying and understanding the immense diversity of life on our planet. Carl Woese's work has greatly contributed to our understanding of evolutionary relationships among organisms and continues to shape the field of biology today.