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What are ommatidia?...

What are ommatidia?

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### Step-by-Step Solution: 1. **Definition of Ommatidia**: Ommatidia are the individual visual units that make up the compound eyes of certain arthropods, including cockroaches. 2. **Quantity in Cockroaches**: Each compound eye of a cockroach contains approximately 2000 ommatidia. This large number contributes to the overall visual capability of the insect. 3. **Structure and Function**: Each ommatidium is separated by pigmented cells, which help in distinguishing between the different visual units. This separation allows for clearer and more stable images. ...
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