Organisms belo nging to protista, commonly known as Aoating pastures of ocean, are _________ .

Explanation

**Step-by-Step Solution:**

1. **Understanding the Question**: The question asks for organisms that belong to the Protista kingdom and are commonly referred to as "floating pastures of the ocean."

2. **Identifying the Organisms**: The organisms that fit this description are diatoms. Diatoms are a type of algae that are known for their unique characteristics.

3. **Characteristics of Diatoms**:
- Diatoms are photosynthetic organisms, meaning they produce their own food through the process of photosynthesis.
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