Which kingdom is characterized by heterotrophic, eukaryotic organisms that are multicellular and their cells lack cell wall?

Answer

To answer the question, "Which kingdom is characterized by heterotrophic, eukaryotic organisms that are multicellular and their cells lack a cell wall?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Characteristics**:
- The organisms are **heterotrophic**: This means they cannot produce their own food and must obtain it from other sources.
- They are **eukaryotic**: This indicates that their cells have a well-defined nucleus and organelles.
- They are **multicellular**: This means they are composed of more than one cell.
- Their cells **lack a cell wall**: This characteristic helps differentiate them from plant cells, which do have cell walls.

2. **Analyze the Characteristics**:
- Since the organisms are heterotrophic, they cannot belong to the plant kingdom, as plants are primarily autotrophic (they produce their own food through photosynthesis).
- The presence of eukaryotic cells indicates that these organisms belong to a kingdom that includes complex cells with nuclei.

3. **Consider the Types of Organisms**:
- The multicellular aspect suggests that we are looking at a kingdom that includes organisms made up of many cells, as opposed to unicellular organisms like bacteria or some protists.
- The lack of a cell wall further narrows down the options, as this is a defining feature of animal cells.

4. **Conclusion**:
- Given all these characteristics, the only kingdom that fits all these criteria is the **Animal Kingdom**. Animals are multicellular, eukaryotic, heterotrophic organisms that do not have cell walls.

### Final Answer:
The kingdom characterized by heterotrophic, eukaryotic organisms that are multicellular and lack cell walls is the **Animal Kingdom**.

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