Organisms in the Kingdom Animalia are

Options

A. multicellular and heterotrophic
B. multicellular and autotrophic
C. unicellular and autotrophic
D. unicellular and heterotrophic.

Explanation

**Step-by-Step Solution:**

1. **Identify the Kingdom**: The question asks about organisms in the Kingdom Animalia. This kingdom includes all animals, such as humans, fish, and insects.

2. **Understand the Characteristics of Organisms in Animalia**:
- **Multicellular**: Organisms in the Kingdom Animalia are multicellular, meaning they are made up of more than one cell.
- **Heterotrophic**: These organisms are heterotrophic, which means they cannot produce their own food and rely on other organisms (plants or animals) for nutrition.

3. **Evaluate the Options**:
- **Option A**: Multicellular and heterotrophic - This is correct as it describes the characteristics of animals.
- **Option B**: Multicellular and autotrophic - Incorrect because autotrophic organisms can produce their own food, which is characteristic of plants, not animals.
- **Option C**: Unicellular and autotrophic - Incorrect as this describes single-celled organisms that can produce their own food, like some bacteria.
- **Option D**: Unicellular and heterotrophic - Incorrect because this describes single-celled organisms that depend on others for food, like protozoans, but does not apply to the majority of animals.

4. **Conclusion**: Based on the characteristics of organisms in the Kingdom Animalia, the correct answer is **Option A: Multicellular and heterotrophic**.