Correct the way these scientific names are written: Brown rat ___________

Explanation

To correctly write the scientific name of the brown rat, follow these steps:

1. **Identify the Genus and Species**: The scientific name of the brown rat is composed of two parts: the genus name and the species name. For the brown rat, the genus is "Rattus" and the species is "norvegicus".

2. **Capitalize the Genus Name**: According to the rules of binomial nomenclature, the genus name should always begin with a capital letter. Therefore, "Rattus" is correctly capitalized.

3. **Lowercase the Species Name**: The species name should start with a lowercase letter. Hence, "norvegicus" is correctly written in lowercase.

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