The related classes are placed together in the same _________ while a class contains the organisms of related __________.

Explanation

To answer the question, we need to fill in the blanks with the appropriate biological terms. The question states: "The related classes are placed together in the same _________ while a class contains the organisms of related __________."

### Step-by-Step Solution:

1. **Identify the first blank**: The question mentions "related classes." In biological classification, related classes are grouped together under a higher taxonomic rank. The correct term for this rank is "phylum." Therefore, the first blank should be filled with "phylum."

**First Blank Answer**: Phylum

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