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I would say microscope because that’s what was used to to figure out about these other organisms. Sorry if not
The Five Kingdom classification system was used until the invention of option A. the microscope.
What are the five kingdoms?
The living organisms should be divided into five different kingdoms i.e.
- Fungi
- Protista
- Animalia
- monera
- And the plantar.
These are based on the attributes like the structure of the cell, nutrition mode, reproduction mode, etc,
Based on this, we can say that The Five Kingdom classification system was used until the invention of option A. the microscope.
Correction on the title: What are the five kingdoms Please use bullets to enumerate the kingdoms
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