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Which kingdom was added third, for unicellular microscopic life?

AProtista
BAnimalia
CPlantaeaa
DChordataa
Answer & Solution
Correct answer: A. Protista
1. Plants and animals are both multicellular. 2. Microscopes revealed single-celled organisms that fit neither. 3. Protista was added for them. 4. So the answer is Protista. _Source: syllabus Science, Ch 12 'Patterns in Life: Diversity and Classification'_
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